Thank you all for comments.
I have gave some tips for desoldering on this forum as well and homemade my own PCBs for some decade ago and also repair my own electronic - all from time to time, in order to avoid excessive cost and sloppy work of electronic services to replace some capacitor with a garbage one and forced me to go again after a month or so and get rip off again and again... Thus, I'm not complete beginner, but this board make me to ask these questions and reconsider all.
With my own homemade PCBs, I never had experience as such. I still use 0.5mm 40/60 Pb based solder wire and do always re-flow joint with fresh on when desoldering, keep off extensive heat, checking first the joint is soldered with lead or lead free, etc, etc.
However, with copper boards I use for homemade, I never experience anything similar. The pads on my PCBs are the same size, quite solid, traces as well 2-3mm wide for such PSU purpose, however I never manage to pull it out (not even 1mm wide one), even I abuse it with 260-350C heat and desoldering pump during initial testing every new copper board type I used. Smallest 0.3mm tick pads and traces can be easily pulled up, but they will stay stiff, not act as an aluminum foil...
There is a large difference in quality of pertinax material (I use only for homemade), "lamination" and copper thickness, but I never had a problems as on this "manufacturers" PCB...
BTW, I can hardly recall what exactly is a standard for thickness of copper (I read long time ago somewhere), however it is some figure around 50 microns. In any event, I will compare it on this board and sheets I use...
I will avoid further both methods I used on manufacturers PCB so far and find some fresh desoldering wick instead.
Thanks again to all for valuable comments.