Two reasons why this series is possibly real. 1. If Matt really was faking all of this, and he made a video saying it was all fake and showing proof of it then he would lose almost his entire fanbase on that channel at least. 

2. It makes no sense to keep a bit going for almost 1000 days in order to gain attention. Especially sense the series had waves of details in the beginning. Meaning that there were months of no updates on the series. And those dips were before and during Covid.