I saw a lot to 'fix' but I'm going to defer to the faster/better swimmers here mainly because - 25-26 min in all the 'fair swim' (noncurrent) Olys I've done here in Norcal would be the top 5-10% of the field, so calling that slow is kinda nuts. Also, on the video, is that your 1:35 pace? It's hard to tell due to the tether, but if I'd imagined you without a tether, I would have guessed that to be 1:50pace or slower. Again, per your given race times you're faster than me, so don't shoot the messenger!

His HIM swim pace is even faster than his Olympic distance pace

I swam my last oly in 25:44 and last IM in 1:07, so yes, the pace is almost the same in all the distances, around 1:40-1:45.
Last year I did a 5:52 400m test.

I swam without master group this year, so maybe worse.

The pace on the videos is easy pace. I'll try to make a video in a real pool and at race pace after holidays.

Maybe I’m not understating

Looks like 9 seconds per 100 yards faster in the Ironman race

Yes, I made a mistake. 1:07 is a 1:36 pace.
Maybe there was not the distance, it was the tradeinn 140.6 Girona in Spain, 2nb edition. And I was swimming more than today, I finished 32 age group.
Last Oly was the "triathlon du mont blanc" in Passy (France), swam 25:50 (65 position on the swim), finished 9 overall with a good bike abd run. You Can check it if you want.

Why would I lie ? I'm just here to improve my technique cause yeah, I know it, I'm a bad swimmer..
Maybe dont answer if you have nothing more usefull than talking about mathematics ?

Your times are from a long time ago, but assuming you're still relatively the same, your swim speed is pretty quick. But if you're out of the water at 65 and finishing at 9, your bike and run are even better. So, swimming a 1:07 IM means you're probably better off hiring a solid tri swim coach near you. It will be a lot better for you to have someone who can see and give advice while you are swimming. Just having folks from the forum try to help might hurt you more than help you. And most of us find it difficult to help someone so much better than we are because we don't think there's much we can add.

Good luck

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Not a coach. Not a FOP Tri/swimmer/biker/runner. Barely a MOP AGer.
But I'm learning and making progress.

Your elbows are lower than your hands, instead of the other way around. You need to rotate your shoulders up towards your ears to let your elbows come up and your hands to point down without such a significant break in your wrist. Imagine lying on your side and trying to reach over a barrel or physio ball - that's the curvature you're seeking in your catch. Your hips are also very low with a big sway in your back. Try floating with your toes in the gutter (or kicking gently across the surface) while trying to keep you lower back dry - but not by pressing your head down.

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I wrote this, you should read it:
https://www.slowtwitch.com/...n_Swimming_6700.html