Why would someone spend a lot of time commenting on the game of weak players? (relatively speaking, of course).
There's also another option: during a joint stream in the final stages of tournaments (including 2v2), upload all the replays and edit the game turn by turn. A replay might last, for example, 7 hours in total, and that's just from one player. But during editing, the turns of two players can be fit into 4 hours. In addition, you can speed up or cut out easy battles, shorten restarts if there are obvious reasons, and as a result, experienced players might be able to comment on such an edited replay, maybe even together with the players who participated.
Spending 3 hours watching a game turn by turn or spending 7+ hours, doing who knows what in between the players' turns – I think there's a difference.

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