returner said:
"Getting back to the Necronomicon, the Simon copy has been altered and so have the symbols. This does not mean the book is fiction; it has just been altered and corrupted."
https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/Necronomicon.html
If you use that its your own fault as someone told you.
I'm 99% sure that this quote was referring to the numerous other symbols that were shown in the Necronomicon itself from page 34 onwards, which as you correctly stated are corrupted.
As for the "Book of fifty names" portion, The author even stated that, while the
description of the mantras was interpretively translated,
the mantras themselves were left untouched.
And I highly doubt that it was any different for the sigils.
Why would the ministry employ the 15th mantra as one method of magick in the official JoS "Money Spells" pdf if it was corrupted and/or dangerous?
I stand by my opinion which is backed by personal results and experience, as well as secondhand confirmation through other people, that the mantras and sigils from the book of fifty names are legit.
And if nothing else, they are at the very least
safe to use, and as such there is no point in trying to scare people away from them as everyone can just try them out for themselves without any risk, to form their own opinion.
If you look at my posts I never portray the necronomicon mantras as anything "superior" to the runes. It's a fact that people are individual and different types of mantras will vary in their effectiveness depending on the person. As such the best way to determine what should be used, is to list the various options and try them one by one comparing the energies, then choosing the best one for the individual.