Re: Can't restore electrum wallet from seed or private key

So, it seems to need the Trezor hardware to recover a Trezor wallet.

Yes. It is one of their security feature (https://doc.satoshilabs.com/trezor-user/recovery.html). The Trezor screens tells you which word to enter in a random sequence (ie: word #4, word #17, word #2, etc). This way, if you steal the seed words from your best friend... you also have to invest in buying a new Trezor!

No this is not true.
If that would be true than every Trezor would need to shuffle the words the same way and that would be a lame security feature.

It looks to me that the seed words are shuffled for cases where your computer is compromised.
This way a hacker might gain access to the 24 words but not to the correct order of them so he will still have to brute force it which will take him time.

tl;dr
If you have the seed you don't need to buy a Trezor.
Recovering Funds without TREZOR Device

You obviously don't own a Trezor.

I own several Trezors and the link quoted is correct. It is from the Trezor user manual, I think they know their own product. It is a good idea to keep a spare Trezor around in case you lose or break yours.

KeepKey does not allow you to passphrase protect your seed using the Chrome extension. If you want to use a passphrase with KeepKey you have to use Electrum.