I don’t think that’s what the meme is claiming.
I think instead it’s just claiming that all fossils have the same implied increase in maximum size implied by the paper, not just T rex.
I’m guessing the illiterate paleo fans were excited that maybe T rex was king of the dinosaurs again, but the logic fails if all the dinosaurs get bigger max sizes…
If that were the case then the first sentence wouldn’t claim that there are physical limits.
I dug up the paper.
“Biomechanical and ecological limitations notwithstanding, we estimate that the absolute largest T. rex may have been 70% more massive than the currently largest known specimen (~15,000 vs. ~8800 kg).”
https://onlinelibrary.wiley.com/doi/10.1002/ece3.11658
That is the paper says, if we ignore biomechanical limits, statistically there could be a T-Rex that’s 70% bigger than what we have already found.