The reporting that the guy stabbing is a copycat crime is 100% promoted from the media. He's some random dude that stabbed his boss. I believe that some are trying to group him into the same category as the UHC shooter, random stuff like this probably happens every day.
I'm not sure how politically motivated that was. The story I read was he was in a higher level position, in a morning meeting. Quickly left the meeting, showed back up 5 minutes later with a "surgical mask" and stabbed the boss before running off. The boss survived, the guy was probably a run of the mill psycho and probably didn't put the same amount of thought into it as Luigi did.