No. The Yankee Hill Machine R9 will be compatible with the YHM 3-Lug Mount and YHM Nielsen Booster Assembly. The Yankee Hill 2045 3-Lug Adapter Assembly can be found linked below:
https://www.opticsplanet.com/yankee-hill-2045-3-lug-adapter-assembly-1-3-8-24-tpi-aluminum-stainless-steel.html
per YHM R9 page on their website, YHM-5M2-QD works with R9: see the image with Distance from rear of suppressor to first baffle.
https://yhm.net/products/the-r9---9mm-suppression-system/