Wikipedia says a 3rd gen with the 2GR-FE engine, which would have been the one in the drag race, has 266 HP. Toyota says the 2023 Hybrid Sienna has 246 net system HP. The engine is only somewhere around 186, but assuming your battery isn't empty, when you floor for acceleration like in the above video, you get 246 HP, not 186 HP.
Wikipedia also says the 1st gen Sienna was ~200 HP, second gen was 230 HP from 2004-2006, and then the 266 HP from 2007-2016 (covering 2nd and 3rd gens), jumping up to 296 HP in the end of the 3rd gen from 2017-2020.
I don't think my 2014 is underpowered, and specs (and video) show for brief acceleration the Hybrid is gonna be about the same. Maybe Toyota took a step back in the "horsepower wars" that seem to affect all cars these days, but it's still got just a little
less power than the longest running engine (the 2GR-FE) that was used for 9 years, and more power than Siennas had before that.
Also, I will keep saying: Within a couple years, Toyota will have a plug-in Sienna hybrid, the Sienna Prime, that will have over 300 combined HP. This is based on the fact that the RAV4 ICE is 203 HP, the RAV4 hybrid is 219 combined HP, and the RAV4 Prime is 302 combined HP. The ICE engine between the RAV4 hybrid and prime (plug-in hybrid) didn't change, but the larger battery let them use bigger motors and put out way more HP for short periods.
My gut feeling is that people passing on the hybrid Sienna because it's a hybrid haven't actually ridden in a hybrid. Like many, I poo-poo'd the Prius...then I actual rode in a coworker's Prius and I was like "wow, this this is nice, and it has a surprising amount of power!" Then I watched Weber Automotive's video on the Toyota hybrid transmission and I was like "holy &*@# this hybrid transmission is so simple
and WAY less moving parts than a normal transmission!"
If you are passing on a hybrid BECAUSE it's a hybrid, please, go actually test drive one. Or if you have any idea how normal transmissions work and just how many moving parts and fiddly bits they have, watch this video and prepare to have your mind blown how mechanically simple the Toyota hybrid transmission is: