Re: Target market
I'm not sure where you are getting your figures from, but IDC say that Huawei have a much bigger market share than you imply. Perhaps it's not cut into the "high/low" classes you mention though:
Anecdotally though, I felt that the P30 and P30 Pro (as well as the P20 equivalents) got more than enough mindshare to be considered viable high end purchases. And looking around my own bubble, I see more Huaweis than Samsungs and Apples.