In C2PS_20_CM-LR-Export (Lightroom Export) Michael and Jeff export images to TIFF-files. They do not use Compression at all. The compression is mentioned by Michael, but not discussed.
OK, there is nothing wrong in that. But using LZW-compression you save a lot of disk space and the image quality is not affected at all. Maybe they have mixed jpeg and lzw compressions.
For example with Canon 5DM2 you get 60MB tiff files without compression. And with LZW-compression you get around 30MB.