Thanks to Wikileaks publishing the Dutroux Dossier in 2008, we know hundreds of snuff films were recovered from the notorious pedo-rapist Marc Dutroux.

Just because the police keep those films as sealed evidence that are never published does NOT mean snuff films are an Urban Legend. I can see why the police always keep snuff films secret. Imagine what would happen if snuff films were uploaded all over the Internet? There would be mobs of angry villagers armed with torches and pitchforks descending on jails and prisons to lynch pedos. It would make harassment from QANONs look like school yard bullying.

(The films were, according to your reference, made only for blackmail purposes, and therefore certainly not made for enjoyment of any viewer, nor were they ever distributed to other people for their enjoyment. The reference does claim that people were killed in a specific place which was also filmed, but does not, what I can see, explicitly state that any murders were actually filmed, other than incorrectly calling all the films “snuff” films.)

https://www.snopes.com/fact-check/a-pinch-of-snuff/

Regardless my point was just that in my experience many would consider them 'snuff' even if it doesn't meet the exact technical definition.

And those people would simply be wrong.

I mean, let’s back up a bit. Why is it important whether or not “snuff” films exist? Because many people want to believe the common urban legends about it – i.e. that there exists an (be it ever so small) underground production and market for it, even though, by all accounts, this does not exist, and has never existed. Believing such urban legends helps people feel justifiably horrified and helps validate their cynicism; basically the same reason why many people believe many other urban legends. However, no movies fitting that particular model have ever been found to exist.

If anyone wants to to be picky about the definition and claim that some movie or other fits the definition of “snuff”, or is “considered” to fit even though it doesn’t(!), this is only because they want to be able to say “see, snuff films exist!”, and thereby validate their preexisting belief in the urban legend. But this is a motte-and-bailey fallacy; it tries to defend the urban legend (which is hard) by trying to defend a technical definition of a word to be slightly wider than it really is (which is comparitively easier). Luckily, even though it is easier to defend, this latter position is still demonstrably wrong.