If it's flying in a line, will the vortex be such massive? I'm not sure, so maybe some experts here can help explain that?
J-20's reference video: (At 0:44)
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Notice how in the picture you shared the J-20 is pitching up and not diving? Or did you also notice that when the J-20 was banking on a level plane, vortices also formed over the wing surface. Not to mention the video quality is complete utter garbage and it's already hard to tell the direction the J-36 is facing due to it's triangular nature but nothing you have shown is concrete proof that the J-36 is in a fast downward dive. There's nothing that otherwise disproves that the video could've been rotated or altered in some form to greatly exaggerate what's actually being filmed.
Especially from unofficial Chinese media. I've seen all of those CGI's, photoshops, video speed manipulations, all in an effort to paint the Chinese aviation industry into something it isn't. Those kinds of Chinese fanboys have forever ruined a lot of credibility of dubious images and videos posted on Chinese media sites like douyin and weibo, all to get clicks? This isn't even a comment on this video anymore, there's almost a race in China to see who can fool Deino the fastest with realistic photoshops and video edits. Fakes like that blurry J-36 clip with reheats on solidifies my point, a fake that has now spread far and wide across the western internet to the point where most people now think it's real, and it's hard to explain to those who don't follow the debunks that those are fakes made by the Chinese internet. Because of this proliferation of fakes, caution must be taken going forwards, video's and photo's will be questioned at every turn, not only is this something I find incredibly annoying but you'll find it's annoying when video's that you believe are real have their validity constantly questioned.
Is this apart of the Chinese grand strategy to fool Western OSINT? Or is this just a bunch of annoying idiots behind the firewall who think it's funny to bomb the credibility of their nation for some humorous laughs. In no other defense sphere have I seen the absolute amount of fanboys taking it to the extreme of trying to pass their shitty photoshops as real insider imagery. This is my rant on why I'm being so critical of the videos.