Enevhar Aldarion
Hero
It didn't have to be more than once. More likely, that footage was taken during the events of Shang-Chi and went viral on the internet, but it wasn't until Emil's upcoming parole and the She-Hulk factor bumped up public awareness that people joined the dots and realised it was The Abomination in that footage.
I would have to go back and watch everything again and listen carefully, but I swear I remember Wong saying something to Abomination in Shang-Chi along the lines of "see you next time", which would mean it was not a one-time thing.
There is also this article linked to Wong and the fight club, though it does not say if he and Emil fought more than once.

Wong’s Abomination Fight In Shang-Chi Explains An Infinity War Mystery
Wong's fight answers an Infinity War question.

And this one explains why Abomination and Wong were used at all in She-Hulk. Despite the big gap in release dates, the movie and show were being filmed at the same time, in the same location.

'She-Hulk' finally explains why Wong was fighting Abomination in 'Shang-Chi'
Why was Wong (Benedict Wong) fighting Abomination (Tim Roth) in a seemingly throwaway scene in 'Shang-Chi and the Legend of the Ten Rings?' 'She-Hulk: Attorney at Law' finally revealed the answer.
