Have you personally reviewed the code of 7zip to ensure there are no flaws in its encryption algorithms?
Did you take steps to mitigate against known vulnerabilities such as this one: https://nitter.cz/3lbios/status/1087848040583626753?
Did you make sure to build the app yourself from the source code you reviewed to ensure you haven't downloaded a fake or malicious one?
How to you plan to do any of that for WinRAR given that it isn't even open source?
Did you only encrypt your data on a permanently airgapped device with a clean OS?
Did you make sure to delete all the temporary files it creates in the archiving process, and then write over those sections of your computer's memory with junk data?
Did you make sure to delete the unencrypted text file you would have first stored on your computer before encrypting it, and then write over that section of your computer's memory with junk data?

It isn't reliable. Here are 100 million reasons not to rely on your memory: https://bitcointalk.org/index.php?topic=5402270.msg60342177#msg60342177

Biometrics, especially fingerprints, can be very easily bypassed, even on high end 3D ultrasonic fingerprint scanners such as those on the latest flagship phones - https://bitcointalk.org/index.php?topic=5281976.msg55391797#msg55391797. It will be trivially easy to fool a basic USB fingerprint scanner.

Do they also have a bridge to sell you? People will say anything to sell their product. How do you plan to verify this claim?

Will you only be decrypting them them on a permanently airgapped device? Will you be writing over the sections of the computer's memory which held those unencrypted files after you are done?

There is a reason that everyone here and every good wallet tells you to write down your seed phrase and store it offline. If you want to ignore all that advice and do your own thing then obviously we can't stop you, but you greatly increase the risk of loss.