netatmo is a totally disorganized and confused company. it has been appearing as compatible with SmartThings for years, but it refers to the thermostat and valves. a very bad and useless integration. the integration of the weather station on the other hand has never been done by netarmo, what was there had been done by a user of the community, now with the closure of the groovy-based Smartapps, it doesn’t work. Netatmo has not announced any plans to perform this integration, totally incompetent customer support just say their API is public and anyone can build its integration.
For awareness for those looking for weather integration with SmartThings - I have a an Edge driver that supports WeatherUnderground, OpenWeather, US Gov, WeatherFlow Tempest, and Finnish Meteorological Institute weather data sources. There is a catch - and that is that you need to have an always-on computer on your LAN to run a proxy to allow the Edge driver to issue HTTP requests to internet addresses.