Indeed.
I didn't watch the whole stream but from what i remember from 2 clips, he basically said he LITERALLY saw the squads and therefore acted upon that (even though the replay doesn't show it). It's the AssG sprint part and the cancelling of the Volks sandbag. Not sure if there are more.
Some of those sorts of clips are pretty hard to gauge, honestly. There's some disagreement on precisely how accurate replays are in terms of FoW (Though I haven't seen much to indicated that it's fantastically desynched).
Being generous, the fastest you should see one of his units "react" to something coming into view would be (200~ms + input delay), with the 200ms being the average (single stimulus) reaction time. For clips like the Volks stopping constructing sandbags, he's clearly faster than that, but if the FoW on his end wasn't the same as what we see on the replay, it... could be possible?
There's also the possibility in that particular case that he just stopped the sandbags because he got cold feet and was expecting the Paths to arrive soon... but he outright stated he reacted, so that option's out.
I'd really like to know exactly how accurate replays are, but I dont think there have been any thorough stress tests done.
Snip
Again, yeah, this particular instance with the T-70 really doesn't show what its being suggested to show. The shot doesn't connect with the T-70, and it doesn't even seem to visually curve from what I can see. This particular instance is not indicative of some sort of "Targeting hack", in my opinion.