To clarify, he's talking about the betas for each update. v0.19 is currently in Beta 3, as v0.19 is not yet complete.
I know where you're coming from though, Harem Hotel as a whole is not complete and could be described as a beta entirely.
You probably already know this, but just to ensure we're on the same page:
"v0" = Version 0, meaning unfinished. v1 would be finished.
"vX.19" = Update 19. Counts how many major updates there have been.
"vX.XX.2" = 2 patches . Bug fixes or other small changes
The latest version I've developed is v0.19b3. The third beta of v0.19