Yes, I know this video, it was broadcasted for promotion purposes. But ingame: nope. And the Thargs we have met so far never attacked us with slime directly (?) like in the video, only with the help of these rockets since the Marauders appeared. What is so difficult for FDev to program such an attack ingame? Or is there a special purpose behind that they don't do it? Why aren't we allowed to fight against Thargs directly who/which are just attacking a starport?
Caustic missiles were in the game since the Thargoids returned (2.4), the Interceptors fire them too (usually shortly before dying) and the acid slime is just the same. You can also get the green goo sickness from flying into their death clouds, in both cases, you'll see the same green corrosive blobs on your ship that also decorate the damaged stations.
Why we can't actively defend starports against the attacking Medusas I don't know. Possibly, starports are implemented as different models (normal, burning repairing) and damage is not dynamic. Another question would be why megaships can only jump after server updates. Think there's a technical limitation here.
O7,
[noob]