To follow on from my own question, what I decided to do was follow the Steam updates page (since it's not full of memes like twitter) as an rss feed using a browser rss extension (Feedbro for Firefox in my case). This already worked to tell me about the first hotfix
The page:
https://store.steampowered.com/newshub/app/1086940The RSS feed:
https://store.steampowered.com/feeds/newshub/app/1086940/?cc=GB&l=english&snr=1_2108_9__1601