It'de great news sure, but if it does not come from official channels of comms, then it was likely dubious info to begin with.

Seems low, probably more.

It's definitely plausible. Famitsu has the Switch 2 at just over 1.4M as of June 29. It's probably at a good bit higher than that in the U.S. given the launch week was higher (1.1M, compared to 948k in Japan). Let's just say 2M for North America as a whole. That would leave about 1.6M for the rest of the world. Given the lifetime split for the Switch 1, which has a JP/NA/EU/ROW split of 24.4/38.3/25.8/11.5, I'd say if the actual outcome is comparable to that, the actual number is probably closer to 5.5-5.7M.

Regardless of the actual number, that's already well ahead of any previous launch month (it also helps that it was a simultaneous worldwide launch). The PS4 sold 4.2M in its first six weeks (NA + Europe sales only, since it wasn't out in Japan yet). While we don't have comparable sell-through data for the PS5, its launch quarter shipments were the same as the PS4's, indicating comparable sales figures. Those were very strong numbers, better than pretty much all other consoles in history at that point, making them the now-previous record holders. But the Switch 2 has surpassed 5M in only 24 days, or 3-½ weeks. That doesn't just beat the record. It smashes it. It's pretty clear that the "high" price of the system and some of its games has not dissuaded early adopters, who have made this by far the biggest hardware launch in history. Of course, good launch numbers don't necessarily tell us what sales will be months or years down the road, but it is an encouraging sign that the Switch brand is still very strong and has a bright future ahead of it.

I'll wait for their next report in a few weeks before going in depth but considering the data so far over 5m by the end of June is basically guaranteed so it's wild that demand isn't fully fulfilled yet. Switch Owners truly had become desperate for a better Switch.

Keep in mind that Famitsu isn't able to track all sales so it'll be even higher than that by probably at least a couple hundred thousand.

It will certainly fall off a cliff.

[A few years later] Any second now...

Wrong cliff man, 

that one goes upward !

Turned out that data that was shown was actually a test that was not meant to be seen by the public.

I still think it's going to be extremely front loaded in sales compared to Switch 1, but impressive nonetheless. It's bound to almost certainly be at least a moderate success long term with all the third party and indie support plus momentum coming from Switch 1.