https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2020040210&tab=PCTBIBLIO (main paper in japanese)
It is, but if they've got as far as filing a patent application, then surely they've done quite a bit of research beforehand?
Inventors 山村 隆 YAMAMURA Takashi; JP 佐藤 和貴郎 SATO Wakiro; JP 小野 紘彦 ONO Hirohiko; JP 松谷 隆治 MATSUTANI Takaji; JP 中村 征史 NAKAMURA Yukio; JP 北浦 一孝 KITAURA Kazutaka; JP Agents 山本 秀策 YAMAMOTO Shusaku; JP 森下 夏樹 MORISHITA Natsuki; JP ▲駒▼谷 剛志 KOMATANI Takeshi; JP 飯田 貴敏 IIDA Takatoshi; JP 石川 大輔 ISHIKAWA Daisuke; JP 山本 健策 YAMAMOTO Kensaku; JP Yamamoto is the first listed agent, but it's probably the inventor names that we are likely to find on papers. There's a T Yamamura who was a joint author with Komaroff, discussed here: Neuroinflammation/PET research out of Japan This thread mentions Wakiro Sato https://www.s4me.info/threads/fundi...diagnosis-method-for-me-cfs.9064/#post-159900
Sometimes, but the priority is to nail down the finding as a patent before doing the research and potentially giving the game away, where competitors can steal a march on them. So if you even suspect a useful finding, you patent it. I suspect most such patents never work out, and you never hear of them again.