(taken after watching [2368] Windows VVVVVV by Masterjun in 13:30.25)
However, this message does not appear when you do the above after watching this submission (try for yourself, if you don't believe me). This also inevitably means that it isn't unlocked in the game modes. The same goes for the the cancelled submission, by the way.
The trigger for Flip Mode to get unlocked is the "Game Complete" screen (where it shows the time taken, found trinkets, total deaths and where you died the most).
The way I see it, it has pretty much the same issue as #3903: Masterjun & FractalFusion's GBC Pokémon: Red/Green/Blue/Yellow Version "glitched" in 01:10.47.
Now, this is how the same text looks like in Hourglass r81 (latest by nitsuja, enforced Japanese locale):
Of course, the text should look like in the former screenshot.
Now, I don't know if this commit is easy to revert (as in, doesn't cause unexpected issues), but it only seems to affect font/text rendering, so it might.
That was a pretty good TAS, you might want to submit it for vault publication.
Followed by libsneshawk-32-compatibility crashing (translated, since I use a French Windows 7):
Problem signature:
Problem event name: APPCRASH
Application name: libsneshawk-32-compatibility.exe
Application version: 0.0.0.0
Application timestamp: 50dbfb90
Defective module name: ntdll.dll
Defective module version: 6.1.7601.17725
Defective module timestamp: 4ec49b8f
Exception code: c00000fd
Exception delay: 00036289
System version: 6.1.7601.2.1.0.768.3
Locale identifier: 1134
Additional information n. 1: 052c
Additional information n. 2: 052cf328a30b43fecf76baa985e4e807
Additional information n. 3: 43ea
Additional information n. 4: 43eaea2b5173927767fc2c9d5dd5421f
To reproduce, just attempt to run any GB game in SGB mode. Note that only the SNES core crashes, but BizHawk still runs.
For the record: SNES ROMs as well as GB ROMs (when not run in SGB mode) work fine.