Yes, I am, because what we've seen of their tools and what they've said about them is similar to games from 2006 (NWN2) and 2015 (Sword Coast Legends) and 2021 (Solasta, which has a map-maker). There are also various 3D dungeon builders designed to work well and fast available on PC. WotC also haven't claimed this map-making tool is revolutionary in its speed or efficiency, which you might expect them to if it was.
You can go full Fox Mulder and say "You don't know, you can't prove it! I want to believe!", and obviously that's fine, but like, I think I actually can make a reasonable prediction. Like I said, you're talking about 10-fold reduction in time, and you don't even have a speculative mechanism of action as to how that would be possible. I'm not trying to be mean here, but it's quite an extreme belief to hold on absolutely no basis whatsoever, including WotC not even claiming that's the case. I could believe it might be, say, twice as fast just from a much, much better UI as result of bigger investment, testing, etc., but ten times faster? I'm looking at the maps they've shown, and if that stuff is all manually placed, there's just no way.
The only mechanism I can see which could do ten times faster is a heavy procedural approach (i.e. you drop a general room "type", it fills it in etc.) like Dungeon Alchemist, but we haven't heard any suggestion that this tool does stuff like that yet AFAIK. Be cool if they have it, but I dunno why they wouldn't be shouting about it.
Where did you post the quote?
I don't think the definition of integration is different, I think you just missed direct vs. indirect. Most VTTs (maybe all) use indirect right now. Sounds like this will too - which is cool, honestly.