[zaroth]

Efficient market theory in no way claims that all companies must always act rationally.

And even more so, you can attempt to make a rational decision, and still be wrong.

It’s also often said about the market, that it can remain irrational longer than you can remain solvent.

[QuesnayJr]

The parent comment doesn't just say "efficient market". It also explicitly mentions "Homo economicus" and "rational company". A rational company makes rational decisions, pretty much by definition.

The saying that the market can remain irrational longer than you can remain solvent directly contradicts the efficient market hypothesis.