My PR-flat bench with an Inzer denim bench shirt is like 412 at 245lbs. My squat PR isn't great bc leg/foot/Achilles injury but let's assume 400. Add another 400 for DL (same issue). You think this clown did over a grand at 148? Critical thinking. You lift so c'mon.
As I noted earlier, I was never into powerlifting. The link I posted earlier lists the number at "elite" level, whatever that means exactly. So not immediately or necessarily dismissible.
I considered the total in terms of my own lifting in my prime. As I posted elsewhere, my best 1-rep bench was 285 when I was a lean 145 pounds in 1992 or 1993. This was a gym competition with judging for form. I never did a 1-rep max squat, but when I did them my best first work set was 245 for, and I'm guessing now, 5-6 reps? Maybe 7? I would then lower the weight for each subsequent set. So what might my 1-rep max have been? Maybe a few pounds more than my bench? Barbell squats were never really my thing. I used to like to max out on leg press at the time.
As for deadlifts, I only did them briefly, and that would have been in the late '90s or early 2000s. I did them on a stand/platform that allowed the bottom of the plate to reach a bit below foot level for a deep range of motion without touching the ground at the bottom of the movement. I only did 225 pounds for 8 or 12 reps (probably the lower end of that range) to the best of my recollection. So what might have my 1-rep max have been from ground level? I'm guessing, or would like to think, something over 300, but I really have no idea.
Adding up my bench with the two other ~possible numbers, I'd say I was within 150-200 pounds of DTB2. It's still a fairly wide gap, but I was never a competitive lifter. I was only ever a weekend warrior. So it is not beyond the realms of possibility.
Just saying.
Look, I don't know anyone here personally. I try to give benefit of the doubt until I find a reason not to do so.