Some communities online can be a little frustrating.
There's a lot more people keeping reptiles these days. Which is great! But there's also circles where people get far too hung up on their own ideals and not just what an average owner can manage or knowing how to correct a possible issue without sounding far too aggressive. It's honestly one of the reasons I don't go there for content.
That said...
The feeding guide isn't necessarily a bad one. It definitely is meant to keep your snake on the lean side. Which is a good thing for most pet only snakes. But if weighing everything out and following it seems a hassle, the good old 10% rule is fine. You'll just need to do your work diligence in watching how round your noodle gets after a while. A solid 10% is far easier for most people to remember than 10-15, 7 and 5 by x amount of time.
On one hand, they are right about the soaking. Ideally, you shouldn't have to soak your BP because the humidity should be monitored to allow for proper shedding. But that said there are some animals who just do like to soak, so I always offer any that seem to act more interested in the water bowl a larger one. I have a male that amusingly likes to blow bubbles when he drinks and sticks half his body in to do it.
You shouldn't be soaking a snake for every shed. They should also ideally be shedding mostly in one piece. A small bit of stuck shed on the back or belly isn't a big issue as long as it sheds correctly the next time...but stuck shed on the head and immediate neck, around the vent or the tail tip? I would definitely offer a soak to carefully remove it.
There is a bit of truth in everything that they bring up... But it's not always information that is properly repeated, is a misappropriation of more advanced husbandry being pushed on newer hobbyists or is just used to be aggressive. Sometimes you have to look a bit deeper to understand which one they are.