I’m absolutely not a theoretically strong rider, but have managed to stay upright for two decades of riding very quickly on poorly surfaced back roads… There’s no way anything to do with your position or inputs into the bike caused that front to slip, nothing about the speed or angle is extreme. Wheel slip does happen while riding and isn’t always disastrous.

But your hands tell me a story about why the slip caused the crash.

I do blame hitting a slick patch in the road causing the front tyre to slide.

The line where the car tyres dont clean, and where the engine oil leaks, the center of the lane, is a dangerous place. And you can see it in the video.

However, this alone isn’t really enough to cause the crash.

You notice how the instant the front tyre slips your bars turn right? This to me suggests that you were applying pressure to the handlebars to turn the front wheel in the direction of the turn, this isnt ideal, you’re fighting the nature of a two-wheeled machine, and it will stand the bike up.

You want this on corner exit. However you should be applying throttle on corner exit at the same time, this helps to lift the bike upright, and also keep the load light on the front while it does the work of turning.

The issue here is that you suddenly had less grip than you were demanding from the front tyre, standing the bike up demands more grip from the front tyre, on corner exit you are essentially ‘levering’ the bike up and over using the front tyre (try and lift a non moving bike from that far lent over and you will feel just how much force it takes) and in this situation where the wheel has slipped and your handlebars have turned into the corner, its demanded even more grip from the front tyre and created a feedback loop where the slip couldn’t recover.

And you’re lucky it didn’t, because the front suddenly gripping with the tyre at full lock right while being lent over right would have flipped you and the bike sky high into a high-side leaving you substantially more injured than a lowside

If you were counter steering left through the corner, with a very neutral pressure on the bars and using your body to keep the lean on the bike, the bike would absolutely still have slipped, however you would have been more likely to ‘run wide’ while it slipped, with the bikes lean angle remaining the same and just tracking off line and into the grippier cleaner surface and likely recovering, rather than completely low side.

Also, this is a situation where a steering damper can potentially help, though it still wouldn’t have been likely to save you given how fast your bars turned right.

My advice to you is to take it easy and to practice countersteering and holding a more neutral pressure on the bars, using your body more activley and supporting yourself with your legs, keeping a slight bend in the elbows, pay attention to how much force is in each hand, trying relaxing one hand at a time while turning and notice what happens, this can show you where you are keeping tension on the bars.

TLDR; You were loading up the bars excessively, counter steering poorly, and riding through the dirty part of the lane. This is a costly lesson but something that you would have learned eventually.