It feels like Tarantula being able to shoot ground targets with Hyperios Missile Launcher is an oversight. It's three times more firepower than stationary Tyrant Seige terminators, and these guys are 300 points, while Tarantulas are 45 points for TWO. It seems like they forget that Skyfire no longer has a penalty against ground targets.
They removed 2.0 Helical Targeting Array from Sicaran and Doritos, and in their infinite wisdom slapped Skyfire on their autocannons instead, so you can't just FAQ Skyfire now. The new quad autocannon stationary gun also has that.
Dorito's Limited (1) Boreas Air Defense missile can now strike ground targets with AP2 D3 at full BS, as can its unlimited laser weapons with D4!
In short, they fucked up, and now they would have to introduce a new rule for overpowered anti-air weapons with Skyfire that can be used against ground targets and carefully watch which weapons they should put it on.