In my previous log I calculated indoor battery charge current would be approximately 50uA. Now I have measured actual charge current. I used a multimeter with lux meter as a reference.
Indoor at 500 lux I measured 61 uA.
Indoor under a table, 150 lux, I measured 12 uA.
This means that TSEM is indeed able to power a very simple BLE or LoRa application.