Well, the article did go on to provide better stats once they changed out the panel and battery:

Since then, the uptime has been 100% (March to September 2020), even though we have added a lot of content by making the website multilingual. This is due to the larger (brand new) battery but also to the better orientation of the smaller solar panel. The battery’s capacity will decline over time, so the higher storage capacity will make it last longer. If the uptime remains 100% through the winter 2020/2021, we will probably downgrade to a 20W solar panel.