Typically this type of head gasket failure occurs from a warped head.
The head will need to be entirely replaced, BTW good time to upgrade to a ported head if you can.
I had a friend with a 6 cyl supra that warped 2 heads, the first time was back at the #6 Cyl where all the heat is in that engine, and second time was because they machined and reused his original head instead of installing a new one. Once a head has warped its trash, do not try to machine and reuse.
The reason the head warps is usually due to uneven heat, maybe a coolant port is clogged with a foreign body or the head bolts have not been torqued in the correct pattern and process (aluminum and iron don’t mix that well when it comes to heat dissipation and expansion and contraction).
When they replaced you cam, after the HPFP melt down, did they pull the head to clean it in a solvent bath. I would have to get all the metal shaving out. If they did there may be gasket material blocking or partially blocking one of the head ports, also if they didn’t follow the head torquing procedure exactly how VAG says it should be done, it could explain the warped head. Also if the head was removed it should have been machined because it will always express a little warp simply due to it being aluminum.