He says: Is it true that women did not observe hijab in front of the Prophet?

ﷺ, and then when Umar entered, we observed hijab from him? No, this is absolutely not correct.

Women used to observe hijab in front of the Prophet.

ﷺ except for his mahrams, only his mahrams did not observe hijab from him.

ﷺ, but in this story, we observed hijab, meaning we hid behind the wall.

And what is meant is not that they wore the hijab, like the saying of Allah the Blessed and Exalted: And if you ask them for something, ask them from behind.

Hijab here means from behind the wall, not the hijab that is worn on the head, yes.