Means nothing, black panther has no chance against him no matter what contingency plan BS writers make. It's called PIS (Plot induced stupidity) for why you have weak level characters even going toe to toe with characters that would curb stomp them. Not saying this is the exact case with Bp vs ironman.
PIS would be T'Challa fighting Galactus straight up and Galactus forgetting that he could blink BP out of existence and instead just punches and kicks him. Which should not be confused with Character Induced Stupidity (CIS) where Galactus simply ignores BP because he feels he isn't worth noticing, which is an inherent character trait......(ie dooms arrogance, spider man's unwillingness to kill, absorbing man's lack of intelligence etc)
PIS is not BP devising contingency plans to neutralize Galactus or turn him away from Earth as there is actually evidence of same occurring more than once.
I don't get you guys when Reed does it, it's accepted and celebrated but T'Challa who not as smart as Reed is certainly up there, is scoffed at.
Go and read Ultimates #1-2 where they actually neutralize Galactus.