I mean sure, but I presume they weren't talking directly about the exact size but that other desktop apps can be built for (at least) an order of magnitude fewer megabytes. In other words, it's not exactly 108MB that they really care about, it's that Qt or other frameworks could make a hello world app at 10MB. That's how I interpreted their comments anyway.
If you want a sneak preview of the functionality that can be delivered in Flutter at about the 100mb mark, sign up for the beta of https://www.superlist.com/