Aave devs propose freezing Fantom integration, citing lack of traction and potential vulnerability

I’m thinking of creating a very secure wallet to keep my crypto for a long time.
What I’m going to do right now is to install a fresh android OS on a virtual machine and disconnect it from internet. Install Coinomi wallet on it and create a new wallet and also protect the privatekey with a bip39 passphrase. write down the recovery keys and the passphrase on a paper. copy the wallet public address and completely wipe the Coinomi app and the OS. Can this assure me that nobody can find my wallet private keys? (Of course I’m aware that still one can brute force it or someone might find the paper)