Actually, I've used this Permafrost + Flooding + Squid combo, too, but it turned out that the Flooding never actually helped. 4 Squids are enough to shut almost any creature-based deck down, so there's no need for flooding. Squid's efficiency in freezing is very good. 0.66|0.5 upkeep to freeze a creature, even less with permafrost and you can choose to cast it only on the times where you need it. Compared to flooding, you need 1 per turn even if the enemy will not use those creature slots and you don't even have any choice to use it to block the first 5.
Against fractal, yes, it works, but against any other thing, nope. RoF does the job better.
I never even saw Flooding interact with SoP in any match I've played. Plus, forced combos are bad. Very bad.