Lightning Network maybe centralize, and is opposed to the Bitcoin decentralized design. I hope the bitcoin core team can implement it as decentralized.
It is NOT centralised.
But, even if it was, it doesn't matter, as long as the base layer is decentralised.
That's unarguably the most important thing.
If you feel LN is centralised then you DON'T have to use it and can just use the base layer that is decentralised.
But if the base layer is not decentralised then there's pretty much no hope; every transaction you make (on any layer ) will be centralised by default since they take their function from layer 1.