Ports sell.

You're missing the point. Not only are those small ports that do not sell systems, but they're NOT made by Nintendo. The fact that these weren't made by Nintendo would support the proposed theory that the Switch is deliberately supply constrained as they haven't released any games that sell their hardware, so there's no reason for them to ship any/many consoles this month. Were any physical games even released in January? This month has been the worst for the Switch since possibly May.

I do know that the first week of January was alright-good sales-wise, but I wouldn't be surprised if the rest isn't as good.

Indies definitely help sell this system. I dare say more people bought a Switch for Rocket League or Stardew Valley than Skyrim or Doom. 

And it's not just one or two indie games, it's hundreds of them, many of which are really good.

Switch is the platform where small and medium-sized titles can and will thrive. This is what makes the Switch stand out from the PS4 and Xbox One, which are increasingly becoming more dependent on AAA titles. 

You will see more and more of these small to medium-sized titles becoming exclusive for the Switch (like Project Octopath Traveler, Bayonetta 3 and Travis Strikes Back: No More Heroes). Square recently said they want to make a new Secret of Mana game with the Switch as the target platform. Square is becoming more and more confident that these small to medium-sized titles can thrive on the Switch. Those kind of games (from big publishers) almost disappeared in the pre-Switch era. 

But what does this have to do with Nintendo supply constraining the system? Nintendo aren't going to see all these indies and suddenly stock the Switch more in January.  That's what I'm arguing here. Some people without any online gaming awareness may go into a store and have interest in the Switch seeing all the games available for it. Indies aren't going to be among those options, besides a few who have had enough success to warrant a physical distribution.

What makes you think Nintendo is deliberately supply constraining the system? Its a nonsense suggestion.

The Last of us Remastered, Halo Masterchief Collection, Gears of war Ultimate edition, Uncharted Nathan Drake collection, Rare Replay

I think you might be right! Especially ports from a console almost nobody had.....

Dont forget best sellng port of this gen, GTAV. :)

I completely forgot lol, but yes proberbly the best excample of them all, and Diablo 3, skyrim, bioshock the amount of remasters / ports is just insane

Personally I won't buy a ton of the ports, since I own a Wii-U but I can completely understand why people jump on them, they are great games.

It's a nonsense suggestion that everyone seems to be making, huh? Did you even see my initial comment when I was tentatively conflicted if whether or not there were supply constraints? I was merely giving reasons as to why it could be supply constrained from a business perspective. I never said it was, at all. All of these were hypothetical suggestions which could reason as to why the Switch had such a huge tank in January besides the fact that holiday season was over. No other consoles saw tanks as bad as the Switch did in Japan either. I've seen subtle evidence that there are stock issues in some parts of Japan like here and many people keep reaffirming on media create that there are definitive stock issues in Japan, along with other English speakers living in the region. Again, I'm not taking the word fully to heart as they could be just generalizing some parts to an entire region, but it seems pretty clear that most, if not all online retailers are also frequently out of stock as well.