A 51% attack certainly could steal from the liquid multisig via double-spending.
You'd probably need more than 51% to attack Liquid.
Pegging in BTC to Liquid requires 102 confirmations. Even if an attacker had 51% of the hashrate it'd probably be insanely difficult to cause a 102 block reorg.
You'd probably need way more than that, but I'm not sure how much. Also Liquid could just increase the amount of confirmations required more and more if a potential 51% attack is underway
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Okay, a miner can steal back their funds. But they can't just take everything that is custodied in the chain
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