Conventional banking and finance remains the bulk of activity within the country and I do not believe this announcement is declaring conventional products banned from the market at large. Rather I think this requirement only applies to a small section of the Indonesia financial industry, approximately 10% of the market.

https://www.ojk.go.id/en/berita-dan-kegiatan/siaran-pers/Pag...

Participating in the Indonesian sharia finance economy would be more akin to something like organic certification on produce. Most farms are not organic but if you want to label your products as such then you have to undergo a certification process with an agency like the USDA. In this case to be certified Halal you have to gain the MUI certificate which is recognized by the OJK Financial Services Authority of Indonesian. However, an Indonesian person is likely better person to clarify this more precisely.