Compared to the others consoles Switch had a very weak boost for February, a 31% weekly sales increase for that month is super low. (you can also just look at PS4 who increased by 81% and XB1 who increased by 67%, in line with the usual february increase).
Also March looks a better month for Switch because February only had Bayonetta remastered while March has Kirby Star Allies and the Smash Bros direct.
That said, kinda doubt Switch will be that high (even though i believe most predictions are too low) , but i have a bet with Rick and untill the best isn't over i'll try to win it. (probabily realistic range is from 300K to 350K)
realistic for you. your predictions for switch have way too high for 2018 so far.