Renault already had contracts with the Alpine/Gordini crowd which prevented them from selling the special engines to another manufacturer. Alpine and Gordini were NOT happy with the Lotus contract and made sure potential future access to the hemi engines was blocked, much to Chapman's disappointment. Lotus then worked at adapting the TC which was not a particularly happy engine when federalized. Renault gobbled up both Alpine and Gordini but it was too late by then. Too bad as federalized hemis continued into the mid-80s.
Since the 1470 engine supplied to Lotus was so different to anything offered in a Renault vehicle, it lends credibility to the theory that they actually sold them surplus marine engines (identical pistons, etc). The 1565 engines were all federalized engines which Lotus had to have to continue selling in the US market.