Just note that the comment was inaccurate, in that their weird encryption is indeed open source at least.

Thanks!

This link doesn’t work for me. Do you have an alternative/original? I’d like to read some context and explanation.

For a no-nonsense working system familiar to Windows users, it’s hard to go wrong with Linux Mint, Cinnamon edition. If it really feels sluggish under that weight, maybe try out the Mate and XFCE editions, in turn.