The recommendation there for 100-character lines is a poor choice.
Even 80-character lines are eye-wateringly long.
I do have a project where there’s a 221-character line,
but (a) that’s machine-generated code not intended for
people to edit and (b) I’m in the middle of rewriting the
generator to not do that (some lines are still excessively
long but that one’s gone).
There is a reason newspapers use narrow columns.
A typical paperback, meant for comfortable reading,
might have 65 characters per line.
So I would recommend keeping lines no longer than 65
characters if you can without making your code ugly in
other way, except for machine-generated code that
people are not supposed to see.