You missed his major point. Learn how to fly the line and your aircraft before heading to the TK. I went through the full course Airbus for upgrade last august. I was on the bus the whole time as a FO.

I had multiple instructors that barely had a year at UA and very little time on the Bus. I had to interject a few times (in a professional manner) when they were wrong. I filled out my critiques and that was my number one gripe.

The training quality improved towards the MV and definitely in the LOE phase. The difference was seasoned instructors.