The problem with that is it runs on a desktop, which means very little in the way of protection against physical attacks. You might be safe from Mossad trying to hack you from half way across the world, but you're not safe from someone doing an evil maid attack, or from seizing it and bruteforcing the FDE password (assuming you didn't set a 20 random character password).
TPM with Heads protects my laptop from such attacks just fine. All based on FLOSS.
> assuming you didn't set a 20 random character password
It doesn't have to be all random characters for good protection.
If someone puts passwords shorter than 30 characters on their devices, then everything that happens to them is their own fault.