[Scoundreller]

Traffic stayed the same and eCPM went down 97.5%?

I guess:

1) You write articles that are exclusively marketed toward an HN crowd (adblock-heavy).

2) Some advertiser(s) were heavily directly targeting users at your site and stopped

3) Your traffic stayed the same, but because of changing search results, so you got more low-value traffic while losing high-value traffic

I'm down 75% as well, but it's largely due to my abandoning my pages and competitors making specialized sites on my niches.