Old school repairers are often the best, especially by those who also know how to lead wipe.
Yes, your repair can be mostly done by welding pulling studs on the panel and using a slide hammer to pull out, a similar technique to PDR. Main difference is that you may need to bolt a pull point to the front of the panel and yank it forward a little while pulling the studs out as that should align the door gap.
Here’s one combo stud welder pulling tool in one
Did your friend give an estimate of repair costs?