Agree with 4g, experienced pilot, CFIT, etc etc. But Goma to Walikale is quite a flight, and scud running on this leg can constantina your aircraft. Walikale is not an airport, you descend into a valley and land on a narrow road. Just north of Goma is a huge mountain, not a hill as stated by the pilot's brother.
I'm sorry but I don't buy ' the crash was caused by bad weather, which resulted in poor vis.'
That neck of the woods is beautiful on a good day and deadly on a bad day. I remember Walikale being dropped by local experienced pilots when the ceiling was low.
Rest in peace and lets hope lessons have been learn't.