That's unfortunate because my gynecomastia surgeon does the proper under-pec cut when excess skin warrants it, and when it's a very flat chest already he does simple liposuction.
Straight cut across is NOT the way gynecomastia is done. It is done like any othrr chest reduction ought to be. The only thing is that the name of a condition is used so men don't feel put off by the term breast reduction.
I have seen many many photos of cisgender males who have had gynecomastia surgery, and never seen those horrid results nor have I ever even heard before of someone cutting in that manner. Sounds like the surgeon doesn't understand about contouring and hiding scars, which plastic surgeons should.
Either that patient had massive amounts of excess skin and didn't initially get nipple repositioning (thus cutting on that line) or something else went wrong, because in Pennsylvania, DC, Maryland, and Virginia none of the surgeons I consulted were dping that.