Please do tell him the truth that, cheap Chinese copies will not bother to put XJ Stainless Steel Frets(which is a pain in the ass to do) and expect a cheap nickel frets in it if it is fake and a pricey Floyd Rose Special for a fake guitar. and considering the carbon-coated cavities, it' ain't fake. I've owned an LTD MH-100QM which is the H-H variant for the MH-103QM. it ain't fake, go tell him that.
You are correct with the frets being extra jumbo (XJ). But they're not stainless steel.
Even ESP Trucksters don't come with stainless steel frets,and that's already ESP. But they're extra jumbo, profile-wise.
They're still just nickel silver fretwires.
Regarding "carbon coated" cavities, it's common for most Asian (China, Indo, Korea, Vietnam, etc) guitars to come with shielded cavities (shielding paint) or just plain flat black paint. It's really not much of a seal of authenticity.
However, the guitar is an authentic LTD for the reason that it came from an authorized distributor (Lyric).