Parent said "store of value" not "currency". Liquidity is probably sufficient for a currency (depending on the features of the liquidity), but it is not sufficient for a store of value.
This is where I personally think bitcoin fails.
I completely agree. I don't think this is different from saying the store of value needs to stay liquid tho. Bitcoin is currently very illiquid compared to many things, but there's no reason to think it's liquidity will decrease, and based on trends and first principles of what makes something a good 'money', significant reason to believe liquidity will continue to increase