pull down to refresh

Liquid is not a second layer
Can you expand on this ?
I understand Liquid is a sidechain but why does being a sidechain preclude it from being a second layer (as you seem to be saying) ?
I did see this part of your article :
Compared to self-custodial Lightning there is more trust involved in using Liquid, because you have to go through intermediaries for the peg-in and peg-out and trust a federation of 15 companies, who are the signers for Liquid transactions, whereas in Bitcoin and Lightning you don‘t have to trust any intermediaries.
Is that part of your argument against it being a second layer ?