TBF when you are training, you have to avoid some stuff that is just negativity- otherwise you'd wonder what the point was! The discussions on this site about pedagogy and educational issues are really interesting, though!
I'm not saying to dismiss what experienced teachers say, but just that it's not a good idea to constantly read about people who are unhappy in teaching.
There will be times when it gets tough- February/March was a pinch point for a lot of my cohort. I think it was a combination of teaching larger timetables on placement, having big assignments to do, having to apply to jobs and deal with everything that comes with that, and the time of year- weeks of leaving in the dark and arriving in the dark can mess with you a bit!
But I think if you are prepared to pick up the slack around these times, then I'm sure that will help a lot.
He does seem to have started work very early for a PGCE, but that might bode well for the Christmas and Easter holidays.
I would be a little bit wary of being so optimistic so soon- presumably he hasn't been into school yet, which is when things start to get tougher! But it's great that he's enjoying things at the moment.
As a bit of practical financial advice, don't forget that the bursary gets paid in 10 monthly installments at most unis, so he needs to save a bit to cover next summer as he won't receive a bursary payment, and won't get paid from his NQT job until some point in September.