It is correct, as I stated in my post MAJORITY of condos maintenance fees will increase over time hence the reason why maintenance fees in older condos will be higher than newer buildings (again in most cases). Even the article you linked says that (read post #4) and they use 1 case the Toy Factory Lofts as an example of condo fees going down in a couple of consecutive years. Toy Factory Lofts maintenance fees have been on the rise since 2015 and are the highest they ever were again proving my point.
I don't know of anyone whose maintenance fees have gone down over the years consistently, it might go down one year, two years or even 3 years by very small amounts but usually following years it does increase and usually by significant amounts as buildings and amenities age they need more maintaining and that costs money. I have never owned a condo that has had the maintenance fees reduced year by year.
BTW Condos.ca is not a statistician for the condo industry in Toronto, they get their information from the Toronto Real Estate Board (TREB) and anything they write on the website is their own opinion, the information about the maintenance fees they would have to get from the Condominium Corporation in the Status of Certificate. The article you had linked was written by Carl Langschmidt who is a real estate agent and owns that website.