Even though your computer gets compromised, the hackers won't steal your private key as long as you didn't store it on your online computer.  All transactions or even crypto signing stuff will be done on your hardware wallet and it will not leave on the computer, and most HWs are protected with a PIN.  So hackers can't execute hacking online and extract your private key, unless if a hacker will physically access to steals your hardware wallet.

All kind of Bitcoin wallets that connected online will be hackable, you should be knowledgeable enough to keep private key safe which is the only one key to access your Bitcoin.