I mained Monk in early MoP - Clash was not all that at all. Taunt into Leg Sweep is a good analogy, if Leg Sweep was single target.
The one good thing about Clash is that it was half a Charge, and that's it.
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He's not wrong about "not dying" and "can survive things others can't". He's also only half wrong about "good cooldowns" (there's only one good cooldown).
Yeah Monks take more DPS, but that's the point. They take more damage over time but they take very little to no spikes. The design is aimed mainly at raids where there's several healers and tanks can die in seconds I'm sure, but a tank that dies less is a better tank.
IF BrM required as much healing as the damage-spike-heavy tanks (mainly DHs, DKs, Paladins), they'd be objectively superior.
I don't think BrM is perfect or even perfectly on par with the others, but maybe there's an outlier of tanks that are too strong rather than BrM being too weak. That and QoL issues for Monk (no baseline spammable AoE threat tool for one).
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On the other hand, classes should be (more or less) balanced FOR it.