Listen, if it was produced and published by Marvel's MAGAZINE department, distributed through traditional MAGAZINE channels, and sold through MAGAZINE shops and retailers, then it's a MAGAZINE, no matter what's inside.
That was the entire purpose of the Marvel Magazine line - to infiltrate traditional MAGAZINE distribution and retail channels to get the higher-end buyers and advertising.
Uh, what about Man-Thing's 1st App in Savage Tales #1?
1st appearance, yes. 1st comic book appearance, no.
Exactly, and since Man-Thing is not an adapted character, it makes things much simpler.