Clearly, concerning BRF 100 I have a doubt about the manufacturer. I have compared it to Fortepan 100, and it seems to be different. Foma is less probabilistic, because of the transparent PET base of BRF 100, compared to Foma Bluish PET base in 120. I don't know if it is possible for a manufacturer to shift base easily. Another point, the antihalation layer color: green! Only Forte and Filmotec have green antihalation layer.
But maybe, there is no link...
Tura was doing the packing and slitting for Rollei/Maco films till end 2005. The Tura company in Düren went bankrupted (2006) together with Agfa Photo (end 2005) because 95% of their business was comming from Agfa.
A small company in Bergheim is confectioning the 35mm cartridges now for Rollei/Maco.
It's not so strange that some production steps are done outside a company. Due to their former DDR contacts I am sure Filmotec (Wolfen, former OrWo, ORginal WOlfen) have also connections in Hradec Kralové (Foma).
It seems that though the BRF15 & 100 may be new to linhofstudio's catalogue, from a Google search they seem to have been introduced last year. So clearly the current stock was not made by Ilford. According to the search some people claimed they were made by Forte but in view of what has been said above this may not be correct. One of life's little mysteries I guess.