Like I said before, it's how you frame her answer.
Because the article says:
Which, I assume, she did not say directly, but is based on this comment that follows it:
So, the article assumes Schaeffer means to say it's a Marvel Studios Darkhold, invalidating the tv shows.
But strictly speaking, has MCU not always meant Marvel Studios + Marvel TV? (At least on here)
Considering the other article she did after the Hydra Soak commerical, where she was asked about Agents of SHIELD, I can only think she meant:
This is the MCU Darkhold, the one native to the MCU, the one we know, and not a new one.
She then says it has a chapter about Scarlet Witch in it, but there's more in it. Other projects will tell you more, probably. ("Probably", because she hasn't watched the shows.) Presumably, she meant AoS and Runaways with those other projects.