My scientific rebuttal is that it really makes no sense given that's not how dysphoria works. There's also the fact that the very article you linked says that it's just observational about how trans people usually are friends with other trans people and follow trans people on social media. Imagine that; a person who is unsure about their gender and may have dysphoria talking to and learning from people who've had the same exact experiences.
I'm not sure why there was such a fierce backlash, although that seems to be because there were initially implications that this was a "rapid-onset gender dysphoria" which the publishers then confirmed wasn't what they meant and changed that later. And now there isn't a backlash anymore?
What I'm saying is you're making a bigger deal about this than it really is. It's a limited study that ultimately says nothing about how dysphoria spreads.