I will reiterate some of my thoughts from last night in a more public forum.

Initially when I saw this run, I was slightly skeptical, but not convinced it was a TAS run. However, the more I compared this runner's "RTA" videos with their "TAS" videos, I became more convinced that it was a TAS. The RTA video shows that they do hold the raise button before tapping, so a consistent tap would need more accurate frame-perfect like inputs. Noticing this inconsistency, I then paid attention to the speed of the RTA run vs. the TAS run. Like z2600 said, improving your speed that quickly would either be a war of attrition with your small motor skills, or just not likely. The original comment with the video said he's been grinding this category, but I just don't buy that much improvement that quickly. That point can be thrown out as pure speculation on my part, and that's fine. Another thing that rubbed me the wrong way was his lack of trying to find clears as the stack is rising. Pre-planning your chains is a vital part of speedrunning modes that need quicker reaction times, and the lack of that in the sub-3 run, to me, means they have all the time in the world to find the clears they want.

The other thing that others were saying last night was referring to the style of gameplay vs. other top level runners. This, perhaps, is the most subjective view I have with the least amount of concrete evidence. The raw gameplay within both the pre-established RTA and TAS videos is very consistent with how I approach these games. I do a lot of chaining through empty vertical columns, and pair it later with horizontal clears with limited amounts of lag chaining. However, through my involvement with the community over many years, I personally know that this strategy I use is not optimal in a speedrunning context for marathon mode. For speed, you need more lag chains and preparation, and less "moving blocks in at the last second" kind of strats. The fact that this runner can move a block in 2 or 3 times in a row, and then get exactly where they want over and again just seems too suspicious for me to believe it is real.

I believe this run, at the very least, should be removed from the leaderboards and have its verification status taken away until there is proof in a series of PB's over the months can show less mistakes and more speed with decreasing times. Until then, I believe that this is a TAS run trying to be passed off as an RTA run, which is a shame.