When someone was playing an handheld video game in a manga, they are usually playing DS/3DS (pretty easy to differentiate). That particular character could be seen playing 3DS in an earlier chapter. :P
Also, the Wii U got represented fairly quickly in a manga, with the game pad clearly visible in the room of an otaku character, I don't remember where though.
Second also, the first Switch cameo was actually in an episode barely 2 or 3 weeks after it's release, in Eromanga Sensei. A girl play with a BIG handheld that looks like the two sides can slide off... It's completely red, but the vent is at the same place, with volume and cartridge slot same place too. It was even posted here. 22 april... a bit later than I remembered. But well before now. :P