I think it's still possible for Spitfire to make play-offs but things need to go right for them and things need to go wrong for Gladiators.
If Spitfire loses against Dynasty, they should be able to go on and beat Shanghai & Dallas and end Stage 2 with a 7-3 record. Gladiators have two more matches left but they're both against decent teams, Fusion & Uprisings. So if Gladiators lose against Fusion or Uprising, they'll also end Stage 2 with a 7-3 record and it will come down to map differential. The good thing for Spitfire is their last two matches are against much weaker teams than Gladiators so they should be able to improve their map differential. If Spitfire manage to beat Dynasty, they're almost certainly gonna make play-offs.
Either way this match is really important for Spitfire, personally i hope Spitfire wins Stage 2 play-offs because it'll be funny.