This is an interesting take; I've often seen the opposition to English as a creole trying to stress that English is a "real" language as opposed to the true creoles, which are as you say often treated as less legitimized.

In that sense saying that English, the language of global communication and commerce, originated from a creole shows that that is a perfectly legitimate type of language and the same is true as other creoles. So to me it does more of a service than a disservice!