Apparently it's a 2020 meme about "make the money printer go brr". I didn't know that one, so I assumed it was a reference to the A-10 Warthog's Gatling gun, which used to be stylized as "brrrt".
I'm not nearly as deep a scholar of memes as some, but I wouldn't be surprised if the two are actually related; I believe they both originated from 4chan.
You're probably right. It was somewhat reassuring to learn of the money printer variant — to me, the Warthog "brrrt" meme evokes human flesh being torn apart (also tanks, but strafing runs often target ground troops, and there are of course people inside those tanks) and it was unsettling to think that this post might be comparing the performance of Tramp to the extremely violent destruction of your adversaries.