I think the audio has changed for this sentence. I've come back to review this chapter having completed it a little while ago and "הכל" now sounds like "תכל". Has anyone else noticed this?
I observed this in a few recordings in duo. It is a technical issue ocurring when the recording starts at the same time as the sound. The clipping noise interferes with the ה and your brain "hears" something like ת (since "t" has also a clickalike sound at the beginning when the tongue touches the palate).
If you want an extra exercise ;-) try listening closely a couple of times and you might hear "t 'ha kol beseder" since the click and ה occur not precisely at the same time but follow very closely on each other.
I think that "Everything in order?" should also be acceptable. It might not be the best grammar, but it is used in conversation that way.