Every dyno you see out there that is not from a manufacturer is a chassis dyno. Nobody is going to pull an engine out, design a custom ECU to be able to fire it up, just to run a crank dyno. Also overall, what matters is power and torque at the wheels.This is not an engine dyno. Chassis dyno can't easily measure power in the low rpm's because torque converter stall speed and especially because of the automatic transmission. You want a 1:1 gear ratio which would be like 6th gear. Even if manually selected, it'll kick down gears once you step on it.
The TTV6 dyno is very nice with a near flat power band throughout the entire range. Makes great torque from 2k rpm and above. At 1500 rpm, the torque converter is still slipping and the torque multiplier is roughly 2.5 to 1 during slippage. There is no shortage of low end torque, especially in low range.
This is true stock but the approach and departure angles are easily changed. That hybrid crossmember hangs down low an inch and there is nothing you can do about it. Just like the 4th gen 4Runners.... often get caught on their low crossmember.
I agree, exterior styling wise, the 250 will age better. Drivetrain wise, the TTV6 will be less labored and certainly less complex. Less labored, especially in the mid to upper range. Less complex.... we can say the hybrid system is reliable as seen on all the Toyota road vehicles but it adds an additional layer of complexity. It's not a redundant system like the LX700h. Off road vehicles are best when simple. You can trail fix a lot of mechanical failures but electronics can strand you worse. You would need an ASE master mechanic with shop diagnosis equipment to fix.
If still not convinced, the rear diff would tip the scales in favor of the GX. It is not only stronger, less stressed... given the high torque of the 250, this should be of consideration for the moderate/heavy off-roader.
About the torque converter slipping during the test, the plot already says it was measured at 4th gear, so it is not slipping. I have no doubt that people who do dynos for a living know how to conduct the test.
But I guess since it makes GX look bad, so we should either ignore it, downplay it, or simply move the goal post.