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It's especially hilarious when you see ads for something while you're using it.

So they got the retargeting part right, but forgot to add a second tracking code for those who signed up. "Woops"

I got ads for a mouse (similar model) after it was bought.

I think I learned in my marketing course that we (statistically) tend to look out for ads for things we have bought after the purchase.

The reason is hypothesised to be because our brain is actively seeking confirmation of previous decisions.

That said, your case most definitely was because of indiscriminate retargeting. Also I guess the effect I mentioned is more visible for bigger purchases : )