Yeah Sanji is definitely using Germa powers to kick light
Ichiji could manipulate light so sanji being able to do it isn’t that big of a stretch.
Given Kizaru’s reaction, kicking a laser beam like that is probably impossible. Neither Sentomaru or Luffy, ACoA users, have shown the ability to do that.
I think Sanji just has the powers of all his brothers.
He used Niji’s “stealth” technique when he used invisible speed against Queen.
IJ also has lightning, which is part of Niji’s power.
Now Sanji can manipulate light, which is Ichiji’s power.