Even if some of the information is outdated, although I believe it’s all still valid, the main points / TL;DR are absolutely relevant. It’s unlikely that the main bureaus will change, and although the exact steps for freezing may change over time, the emphasis on freezing is important.
https://o--h.tumblr.com/post/170549671407/thefugitivesaint-william-russell-flint
The source linked there leads to: https://archive.org/details/lemortedarthurbo04malorich (Page 41)