Gen Z say

[sitifan]

As Gen Z say, I've entered my "delulu era". (My bold.)
Source: https://dictionary.cambridge.org/dictionary/english/delulu

Is the sentence grammatically correct?

 

[5jj]

It is.

 

[jutfrank]

Are you asking whether 'Gen Z' can be treated as a plural subject?

 

[sitifan]

Are you asking whether 'Gen Z' can be treated as a plural subject?

Yes.
https://dictionary.cambridge.org/dictionary/english/generation-z