Oh dang I had no idea somebody made a test of Dooku watching from a distance. That’s super cool. Like you said, I think it just needs to serve as a teaser for whats to come, MCU-style. “Who is that guy? Is he the Sith Lord Mace is talking about? Why is he watching Qui-Gon’s funeral, then?”
Honestly, Tales of the Jedi already breaks canon in this way, allowing this idea to be non-contradictory. Yaddle tells Dooku that everybody is headed to Naboo. Instead, he goes to Palpatine, who apparently hasn’t left to Naboo yet for some reason. We know Palpatine shows up with the rest of the Jedi there, so this is kind of canon-breaking. However, we could retcon all this so that Dooku simply leaves for Naboo along with Palpatine after he kills Yaddle. They already stretch the logistics of Palpatine being in two places at once, so I don’t see why we couldn’t do the same for Dooku.