The specific satellite referred to in the article is Sentinel 5P, and has a website here: https://sentinels.copernicus.eu/web/sentinel/missions/sentin... .

Technically the methane product is a combination of data from Sentinel 5P and Sentinel 2. It's available via Google Earth Engine: https://developers.google.com/earth-engine/datasets/catalog/...

The resolution is... less than I expected. The GHGSat-D satellite seems to have much better resolution, and has a nice public-facing map here: https://pulse.ghgsat.com/