Suicide bombers are purposefully created by a methodical process.

They are often "recommended" to a recruiter and by recommended I mean sold off more often than not by a family member, the 'Uncle' on the "father's side" was the most common one in the west bank.

Then they are groomed showered with gifts, money, girls drugs w/e and that is when the fun part starts a regime of calculated psychological and physical abuse interrupted by moments of the same grooming they were showered with just a few weeks or months ago, religious teachings are very seldom used often only with "problematic" subjects towards the very end.

Suicide bombers are unique in a way that they have had every impulse control reprogrammed for them to be able to take their own life without any gratification and without their fight or flight instinct taking over.

This is very different to something that one would might consider a "suicide mission" as in a mission that has a very slim chance of success because you are always able to convince yourself that you'll beat the odds, you can't beat the odds when you are wearing a suicide vest.

Unlike these other "suicide missions" e.g. grabbing a few AK-47's and going to a French nightclub there is no satisfaction or gratification you don't see the outcome of your actions, you don't feel the adrenaline rush and you don't then fight for your life when the authorities show up fueled by adrenaline and primal instincts.

A suicide bomber is someone that needs to be able to go on a mission they know they won't ever come back from, knowing that they would never be able to see the outcome of their actions they would never know if they were successful there is literally zero joy (and yes I understand how morbid it might sound but think about it from a psychological point of view) in it they never get their hero moment because their hero moment ends before they can experience it.

Now lone wolf and other non-suicide attackers are much more varied it's much easier to convince some idiots to go and shoot up a place in a hold my beer type of fashion because they always can convince themselves they'll win, they won't die they'll become heroes and they can visualize themselves doing that and it's one heck of a power trip.

And again I'm sorry for the morbidity but just imagine yourself gunning down people vs blowing yourself up, heck don't imagine it we have enough video games that play out that power fantasy (this isn't an argument against gaming or violent gaming) but there aren't as many games where you play the suicide bomber or the game mechanic equivalent of it because knowing you are going to always explode/die regardless of how good you are isn't going to be fun and there are zero games that allow you to be the game mechanic equivalent of a suicide bombers that simply end to black the moment you press the button and don't show you the score no one would play that game and in real life that barrier is considerably harder to overcome.

So yeah while you may be able to classify that guy as a terrorist calling him a suicide bomber isn't correct, to me it feels more like the type of a distressed assailant that a few decades ago would be going postal or doing suicide by cop I don't think that he had any real political ideology behind him and neither did the trolls on those forums, but it could be also simply because the other possibility is too frightening to accept.