This is almost every article at Security Today / Security Products. It's their thing.
A few PR people explained it to me roughly as follows: You can get articles placed in Security Today for free. They are definitely looking for other people (read manufacturers / PR people) to submit content so they can minimize their editorial costs / sell advertisements. However, over time, Security Products will turn up the pressure to buy ads / webinars / email blasts, etc.
Video Insight, in particular, has been very aggressive recently in using / partnering / paying Security Products.
Out of all the trade magazines, Security Products is the most transparent / obvious about this sort of thing.
Is the veil getting thinner these days? Sure, and that is a function of the change in the business model / market dynamics of content production. A few years ago, I spoke with a former editor of a major trade pub who ran it in the 1990s. Their explanation was that back then, the trade mags where so flush with money that they could invest in deeper articles and more strongly rebuff manufacturer requests. Now, with the Internet / social media / decline of print, etc., the world has changed.