If the public key is revealed it is still safe from bruteforce if the attacker don't know the range of bits to search for?
Of course.
Many blocks mined by Satoshi have txs with "pay to public key" script (P2PK) instead of "pay to public key hash" script (P2PKH, pay to address).
The public keys are known, but the btc are still there:
block #100
https://www.blockchain.com/it/btc/tx/2d05f0c9c3e1c226e63b5fac240137687544cf631cd616fd34fd188fc9020866PUSHDATA(65)[04
e70a02f5af48a1989bf630d92523c9d14c45c75f7d1b998e962bff6ff9995fc5bdb44f1793b3749 5d80324acba7c8f537caaf8432b8d47987313060cc82d8a93] CHECKSIG
x = e70a02f5af48a1989bf630d92523c9d14c45c75f7d1b998e962bff6ff9995fc5
y = bdb44f1793b37495d80324acba7c8f537caaf8432b8d47987313060cc82d8a93