I personally think point "e" is a wank. It should be obvious that in the sport the competitor should be in the standing position when paddling to catch the wave. But on the way back out or when waiting for extended periods on slower days between sets WHO CARES. It is how they surf that matters. Or should we all suddenly have an urge to post videos of people standing on boards and paddling out.
There are a variety of reasons why a person may drop to their knees on the way out and also why they may sit down whilst waiting on those slower days.
I personally have half the use of my hamstrings of my right leg, half the power in the foot and it sometimes cramps up when tied. The result of oa spinal injury which is why I took up the sport so I could get back into the shore breaks but in an already standing position. I sometimes take a break and sit to stretch. Does this mean how I surf when I get a wave is of less skill then someone who stood while there were no sets

Again I believe you must be standing to paddle for the wave in a contest but don't see what the rest has to do with a surfing contest.
Just my 2 cents worth and a slightly different point of view from a diiferent aspect.