It IS a struggle sometimes, isn't it?
I don't think this is a stupid request at all. Although it may be simpler "production-wise" to have Tomo develop a habit of counting himself in "out loud" and always tap his foot so it's visible in the camera view so it's easier for us viewers to stay with the form.
What I did for this lesson is to learn and remember the form (I wrote it in my notebook from the previous lesson). Then I counted along with Tomo as he played without the backing track....Then I tried to play the backing chords myself along with his solo.
What I found is that .... Tomo his human! I counted and played through 2 or 3 times and I *think* he skipped a bar when he was just soloing. When he goes around the second time, there should be 4 measures of the I chord and I think he switched to the IV one measure early --- or else skipped the last measure of the I chord on the first cycle.
And that is the "ear" part of the training. When I kept playing the extra bar of the I chord, something sounded wrong and that's when I shifted to the IV and everything synced back up again. (And If I'm wrong about that, oh well... I guess I'm the fallible human in the equation then)
That is the only advice I can suggest. It may sound obvious, but ALWAYS, always, count the form along with him.
Sometimes it's hard to lock into the metronome in his head. But after a couple of tries and watching his foot tapping, you can get it and follow the form. Then you can expect the changes at the all right spots... even if you struggle with the chord grips, you can just "scrape" muted notes along with him and say out loud "one... four... one... flat six... five...one..." at the right times as you count the bars.
And when something weird happens, like in this example, you can figure out what the problem is and adjust. So when you play it again, you'll know to just do 3 bars instead of 4 and you'll be in sync with him...
Just remember, when you set up your own metronome and loops and backing tracks, to stick to the form and you'll be fine!
Happy soloing.