I didn't label them all as whingers, the implication was intended that it's what people call PG when they want to whinge. The RNGineers trope is such an example - it's not totally random, but the implication that it is diminishes it. Similarly with Signal Source contents - they obey strict patterns, but are regularly dismissed as random. It colours and perverts the debate, especially for those who aren't familiar enough with elite to know it's really PG.
I hope you can see that it was fairly easy to read as complaint against any who dare criticize the RNG aspects of the engineers. That being said I can understand your frustration - there are a great many aspects of Elite that are procedurally generated, and deserve praise for being well implemented.
However, loot gathering and mod results do not fall into that category. Loot gathering gives you the possibility to narrow down the range of options for the RNG to choose from by following the rules of the procedural generation, but the end result is still random, often from a set of 10 or more possibilites. Two people can follow the exact same track on a planet and get completely different materials within the set available on the planet. That is RNG at work, not procedural generation.
Same for the engineers results, there are boundaries that the RNG must stay within, but the results are still random within the set it can choose from. There is nothing procedural about this.
So if someone calls the planets they find random, I agree, they are wrong. If they call the Engineers process and results random they are entirely right.