I think that you’ll find that this is still the current advice. See the FAQS.
Some people choose to stick with Naim cables or other manufacturers, but of similar specification. Others do not as it is still a free world.
At the end of the day, it is up to you what type of speaker cables and lengths you want to use with your system. Obviously, there may be risks associated with that, but again, that is also your choice.
Enjoy your music whatever type of cable you go for.
DG…