Bybit hacker has 489,395 ETH, to which if they put everything into ETH validators, they would have 15+k nodes. 

etherscan node tracker has 5k+ nodes. Is ethereum fucked if Lazarus decides to run 10k nodes to get a 51+% majority?

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No, etherscan is tracking execution nodes (which might be more realistic of a reflection of how many _real_ nodes exist!), rather than consensus nodes (which incurs the staking rewards). Since there's a limit of 32 ETH per staker, and approximately 33.7MM ETH staked, there's approximately 1.05MM nodes. Realistically, however, there's not actually 1.05MM nodes, they're just "logical" nodes while a process manages multiple validators

BDFL of Quilibrium, Eng @ Farcaster, ex-Coinbase, always opinionated, never hydrated

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also, consensus requires 2/3 of all ETH staked, rather than 51%, so the attack is even more expensive to perform

Yes, I just found out it's 2/3 instead of 51%. And misbehaved block producers can be slashed up to 100% of their stake as well.