First sentence on the first hit when searching for “Gmail smtp imap”:
For non-Gmail clients, Gmail supports the standard IMAP, POP, and SMTP protocols.
https://developers.google.com/gmail/imap/imap-smtp
What you’re referring to is the fact that GMail has apparently disabled authentication using username + password for SMTP/IMAP. I would assume that application passwords still work fine as a workaround, even if they don’t mention it specifically.
The simple fact that buying a $300 device and to “not expect software updates” is not considered a scam is hilarious to me.