Reposting because I want to actually take a swing at the guess: that smooth glow-trail and gradient bleed reads like a hand-drawn vector base pushed through motion graphics (Trapcode-style glow/particle work), not a straight AI generation, the line consistency is tighter than most current tools hold.

Original by Sevd Atas, curious if anyone's guess lines up with mine, or if the real answer clears the bar entirely.