The main thing outdated with the habitat rules is that for whatever reason a few biomes are placed in the wrong type and lumped into a single flavor when they shouldn't be, mainly oceanic biomes, because prior to the ice age they were not split into temperature types and were treated completely differently altogether before the ice comet and the rules simply have not caught up for some reason (a fact I am certain of because if they were taken at face value, a species in both tropical and glacial oceans would be allowed). This looks like it fits into the rules anyway, at least in terms of types and flavors.
That said, I don't think this could go global like that. Shrogs do indeed transport a lot of fauna, but unless these are being kept as long-term pets they aren't gonna get across the ocean any further than about flyway distance, and if they are kept long-term, they would need two additional flavors (coast/shallows and open ocean).
Edit: This thread explains better.
http://sagan4.jcink.net/index.php?showtopic=928