I do think DSP sometimes gets a thrill out of lying, just like what the "I'm good at lying" meme shows, but it's not a joke, he might even take pride on it as if he were in control of something. I don't know how many remember when everyone guessed that his tips goal for some event was a red vest (and a dark one), but apparently they were completely wrong because "he thought" he bought an orange-ish one. It was reminiscing of the Jasper situation, an example of his level of decency.
I also think he applies the concept that in order to deceive more convincingly sometimes you must believe your own lies, but only while talking on camera, he knows exactly what he's doing.
If anyone missed some info, not one but multiple of his mods have confirmed that it's him based on his now deleted Discord account, not even mentioning all the other evidence. The troll theory fails from every single angle, it already has been discussed in detail. What surprises me is the attitude of some of his mods that know the truth but decided to let it slide, and ones that just don't get it like Madara.
Imagine letting someone blatantly lie to your face and all your friends in chat just so that you can keep the green sword (now it's a wrench). If it was for me every bit of data in the #4058 mod chat would've been documented and posted a long time ago, who knows how much nonsense was in that old server. People acted too late, otherwise this would've been over and him feigning distress would be clear to anyone that can put 2 and 2 together.
Just to end with this, if you think about it, the "conspiracy theory" is what DSP wants everyone to believe, because in order to be true several people are lying and fabricating stuff, including those who are near him. You also must dismiss extreme coincidences, consider near impossible scenarios and believe really bad excuses.