This was certainly the case for me, they had commissioned my system a month before I received PTO, and I was live with the app, seeing my home draw from the grid and my PW % keep dropping closer to 0 over the next month until I received PTO. It's really just a matter of when your get commissioned at least in a PW system, I guess maybe solar-only they hold everything until PTO.
I will note that it totally jacks your stats, it was the same thing for me and PVOutput, since I started uploading data a few days after things were commissioned but that meant a month of 0 kWh solar production that really skews the overall stats, with no clear way to say "I want my lifetime data starting when I received PTO", as opposed to the entire lifetime since commissioning with the extra consumption-only days. So in the app my lifetime from grid value is ~66% that month before PTO, and ~33% the 17 months since.