I think this is it, though not sure on the "incel vibe" comment. Don't see how one can come up with that just from a picture.
That being said, I also don't think it is out of the realm of possibility that he coerced someone else to commit the murders while he observed and then maybe got caught up and joined in or something. Or, at the very least, solicited help. I think that if the "have you arrested anyone else" could be telling. Sure, he could be attempting to introduce reasonable doubt, but I think without a murder weapon, full confessions with details known only to the murderer, or sort of accomplice turning on him, there is already a non-zero amount of reasonable doubt potentially. If he really did preplan this in advance, and is intelligent and spent 4+ years studying criminology, I am not confident this will be a slam dunk case. Perhaps he is legit trying to get away with murder and part of that plan WAS getting caught eventually and then using the legal process as his challenge. Perhaps this is all wrong, but I don't think it is any more or less plausible based on anything else we know at the moment.