It's pretty clearly hosted by freecodecamp.com; of course it's something intended to promote them. It's like saying that a post on the Google blog about "getting girls into coding" is an ad for Google.

But it can't be astroturfing, which has a specific meaning about misrepresenting the source of the support.

The stock image is shady, but that's more of a Medium-style-blogpost thing (edit: see below) -- people routinely add stock images in obviously-not-fair-use ways, without permission; the negotiation article used a ton of stills from Mad Men (presumably before they got a nasty letter and took them down).

[1] This one: https://medium.freecodecamp.com/how-not-to-bomb-your-offer-n...

Edit: Didn't check that url -- n/m, you're right, it's something FCC seems to do a lot, not a Medium-thing.