The question that I, and some others, have about statements like this is not what the wait times are now, because those are pretty easily verified with data from places like Touring Plans. So photos of current wait times are not going to help there.
The real question for me is what you are comparing to, and what you mean by "secondary attractions" and "low season". And what were the wait times for those attractions at those times? If they weren't 30+ minutes, what were they, 5, 10, 20 minutes, or what? Do you have some specific dates from prior trips where you didn't see lines at some of these attractions so we could look and see how short those lines really were in the middle of the day?
People seem to like to cite Josh from easywdw as the authority when he says standby lines at an attraction like POC are longer, but then ignore him when he says that lines there are now 30% higher on average. 30 percent higher would mean that a wait time of 40 minutes now would have been 30 minutes before, not a walk on. And that doesn't take into account the reduced capacity from leaving the back row of the boats empty.
Low season is a pretty vague term too. The date you were talking about, Saturday, September 27, was listed by TP as a crowd level 6 day. Much more like slightly above average than low season. With Disney putting in more and more events and promotions to boost crowds during traditionally slow times, the crowd levels at those times might be significantly higher than they used to be. An overall increase of 6% in attendance at MK (and that's just one year) doesn't mean that attendance is up 6% every day over the corresponding day the year before. It is possible, and I would say likely, that the percentage increase is higher at the slower times of year as guests, including foreign tour groups, are drawn into those periods.
I know this isn't true of everyone, but I think a lot of the people who are not surprised to see wait times of 30 minutes or more at some of these attractions that you consider secondary, are guests who have often had to visit at the busiest times of year when waits like this were the norm. So, when we see wait times like that now, we think that larger crowds are at least a part of the cause, if not the primary one. And people who are used to visiting at busy times are less bothered by bigger crowds and longer standby waits because we are used to seeing them and our approach to touring the parks has been designed to avoid them.