Their MacOS revenues might have been <$10k, but given they have a 1000 reviews on Steam and their Android has 100K+ downloads I imagine the total revenue is more like >£80k
If you read the quote, MacOS plus iOS is <$1k (cheapest mac mini + apple dev acct). Given that the article stated iOS & Android have equivalent revenue, you're looking Android+iOS+MacOS at <$1500 revenue. Its not a mobile-first game but 100k downloads suggests a single Android download is worth a penny, give or take. Brutal.