I don't think just because there's no "NHL.TV" displayed with some games, that means that game won't be available in the app.
You get the same thing when you look up the schedule for play-in games starting on Saturday – you don't see "NHL.TV" next to every game, but of course every game will be available via the app.
From the look of my NHL.tv app here in the EU/Slovakia, it appears as if all exhibition games should be streamed via the app, but we shall see (as soon as tonight).
It may vary by country. When I looked at the nhl.tv web site with my US VPN, it stated that they would be broadcasting 10 exhibition games which would match with not broadcasting those two games.