What is your evidence that the malware reports aren't being actioned?

The malware continuing to appear isn't sufficient evidence. Malware moves hosts and ad accounts all the time.

ETA: from the article itself, in 2021 Google "Removed over 3.4 billion ads, restricted over 5.7 billion ads and suspended over 5.6 million advertiser accounts." That's a ton of action, but AdWords alone also serves 29 billion ad impressions a day. It doesn't take more than a few bad actors slipping through the cracks to get seen (and at these orders of magnitude, "a few" is still "millions." Completely impractical for human hand-review).