Is the bitcoin blockchain really non-corruptible?

Is the bitcoin blockchain really non-corruptible?

Some people say that proof of work is better than proof of stake, because it's not possible to rewrite the whole blockchain on-spot. One would need to "re-mine" everything.

But I think this is not true! A hypothetical attacker can rewrite the whole bitcoin blockchain and make the timestamps make the block-time exactly 10 minutes, and this way the difficulty of mining will remain at minimum, and no real mining is required. The mining effort is minimal.

The way I understand it, is that such a problem is practically solved by check-pointing the blockchain in the source code. The devs hard-code block-hashes in the source code so that no one could do that. Is my description of the situation correct?

In other words: Without check-pointing, the bitcoin blockchain is inherently corruptible and can be destroyed. What am I missing here?

PS: This is not about PoW vs PoS. This is basically about the claim that PoW is non-corruptible. If my conclusions are true, we can just do the same with PoS blockchains and use check-pointing to prevent corruptibility.

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