BTW: I would consider recordings with the Nordwestdt. Philharmonie conducted by W.A.Albert much more likely to originate from the 1980s rather
than being new productions for cpo.
While Albert's tenure as a principal conductor with the NWR ended in 1971, he has made various recordings with them afterwards (with works by Pepping, Nicodé, Korngold, Volkmann and others) until the 2000s. From what I heard, the two Sträßer symphonies were recorded in the late 1990s, and were always intended to be released on CD.
It should perhaps be emphasized that cpo doesn't "order" recordings from radio orchestras. I have read amazement that "cpo recordings" are broadcast by radio stations, but that is part of the agreement. These regional orchestras' missions usually include recording the work of regional composers, and they work together with the radio station that they're associated with, and cpo, on recording projects. Something like this is the case for other labels, too, and cpo can be regarded as a "house label" for most of these regional broadcasting stations. This explains how some cpo recordings are available on streaming services, or as downloads, and others aren't – the licensing agreements differ. And some situations are beyond cpo's control. But they might be a bit more open about it from time to time.