This is the one thing this post gets right. Hands and knees is better because then the baby can move downward, if you are on your back you have to push it up and out.

Very normal. My partner gave birth in this position. The stirrups position is abnormal and often worse.

I think you're talking about the position of the baby in the womb, right? Not the woman? Normally yeah, the baby would be facing the other way (still headfirst)

My wife gave birth like this, right on the living room floor and my daughter came out in an egg. The whole thing happened so quick, the midwife only arrived a few moments before she dropped, lucky as she needed to cut the egg open and get my daughter out.
Meanwhile I was lying on the sofa with a broken leg trying to stop our cat from eating everything.

Sunny side up!

That baby is positioned upside-down. They should be facing backwards, then the back of the neck pivots against the pubic bone during delivery.

Its not abnormal. I'm no midwife, but I recall from my childbirth class, its one of a few main positions used.

https://www.lancastergeneralhealth.org/health-hub-home/motherhood/your-pregnancy/5-different-birthing-positions-to-try-during-labor

It's one you can use. The position we normally see is actually not really all that great for childbirth. It generally leads to more tearing, but doctors use it for easy access. Squatting or bent over like that can be easier and more comfortable for the woman. It's just harder to get all up in there to see what's going on.