What is it
“Google My Business is not meant to be a forum for general political, social commentary, or personal rants. Content that does not meet this standard will be removed.” – This is the new text in the Google My Business Post Content Policy‘s page under “Off-topic/irrelevant” header.

Conclusion on this Google My Business Update
Google is trying not to be a political ground and Google My Business listing can easily be used for political views.
Especially with Covid-19 measures, mask use, Black Lives Matter, elections, it’s a ground small local businesses have to tread carefully.
References:
https://support.google.com/business/answer/7213077?hl=en
https://www.seroundtable.com/google-posts-disallows-political-social-rants-29670.html