Agreed its weird; by itself, I wouldn't personally issue any kind of tag over it. Some type of connections to other accounts would substantiate the "account farm" portion.
That is low-key hilarious. I hadn't paid much attention to that account, other than I knew it was an alt right off the bat.
I'll tell you the accounts I have looked into, that I suspect are part of account farms, do a good job of keeping their addresses separate and don't make errors when it comes to accidentally posting under other accounts. More sophisticated analyses that may be considered evidence can be performed but its not really worth the cost (time).