I still don't fully understand — if a low-bit privkey public key is exposed, how could someone potentially derive the private key from it? Could someone please explain how that's possible?
BSGS or Kangaroo would be sufficiently quick attack methods to find a low-bitlength private key fast enough.
For your example PubKey you should provide more details for others, especially what bitlength the private key has.
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To my knowledge there are no known HASH160() collisions so far. Mathematically they have to exist. I haven't even heard of any known RIPEMD-160 collision so far. Please use your brain before you post.