I can see both sides.
The cafe owner is brave and righteous to push back at over-regulation creep in a direct and aggressive way.
The property owner just doesn’t want the building burned down because somebody drove by and got upset with a posted opinion sign.
"...which requested that he comply with government mandates and no longer post “controversial signage or writings.”
Sounds ideological to me. Comply with government mandates. Don't say anything controversial.
What if the government decides that meat is bad for the environment, and his serving of meat is considered ideologically impure and in need of "attention"?
Not so improbable these days, but unthinkable not so long ago.