Depends on what it looks like on infrared.
This is a B-2 on infrared. If a VVLA on the ground can find the hole in the air a stealth aircraft looks like (and they can) and it vectors a fighter with look-down-shoot-down IRST (standard issue on many non-US fighters) close enough, this is what they see, and this can be done from further away than you can see it with the naked eye.
https://www.youtube.com/watch?v=3c6pa_vPE_k
Sophisticated stealth does not negate the ability to use classic tactics like low approaches and surprise.