German twitter seems to read this guy while international twitter calls him a liar.https://twitter.com/Pinboard/status/1194427058350256128 …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Looking at his article (in Google translate) it seems he got spooked by a routine encounter with police. His tweet was phrased in a much more dramatic way.
So police in HK routinely use tear gas on journalists? (Cc @ennolenze )
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.