FilmoTec (ORWO brand) has no own industrial scale coating facility. They never had. When they were founded about 20 years ago (by former ORWO employees) they installed emulsion making and cine film converting facilities. And coating was done at the Forte plant (Forte was also a shareholder at that time).
When Forte closed they switched to Harman technology as their coating partner at that time.
Sort of a side topic, but since it was brought up... are you sure about Harman doing the coating? I always understood that it was Inoviscoat in Germany who were coating ORWO films, since ages ago. Inoviscoat has also coated for Adox in the past (e.g. Silvermax was coated there AFAIK).
In any case I agree, the "produced by Orwo" thing with UN54 edge markings doesn't make sense. If they were going to the trouble of doing an entire run of a new emulsion, it would have its own edge markings. If it has UN54 or N74 edge markings, it's UN54 or N74.
On the other hand, ORWO *do* produce other emulsions for contract. It appears that Bergger's Pancro 400 is produced by ORWO and coated at Inoviscoat, for example. It is not one of the other ORWO emlusions currently in production under their own brand. Bergger's film has its own edge markings, as you'd expect.