That was the same reaction I had when I found out about it, yeah.
It makes more sense when you realize these people see the entire world through this lens of "transness". So anything they like must be trans in some way. What I think happened was some autist had a blahaj before being infected with the mind virus. Once this hypothetical guy trooned out, he wanted to keep hugging his plushie every night but sharks aren't exactly "girly". So he had to come up with some reason for blahaj to be a trans thing. The colors, even if they're not even close to the actual colors on the dickchop tricolor, were a low-hanging fruit. And once the meme started spreading through their communities on reddit and twitter, other troons started doing the same.