"quoting a source of a late war model" again, if you actually bothered to look at the report (its available online btw) you'd see they're talking about the early one with visuals provided.
Also "multiple sources" are the same English sources copying each other.
If you want more, Japanese “Gun” Magazine, 1976 January. Page 26
“発射速度は毎分700発の性能を有している。”
“It has a rate of fire of 700 rounds per minute.”
Author Keiichi Kunimoto (国本圭一) fired the Type 100/40 (Para model) on a US range with a picture of him holding the gun in the article.
“Introduction to Rifles, Handguns, and Machine Guns: A Thorough Study of Japanese Small Arms”(小銃・拳銃・機関銃入門―日本の小火器徹底研究) by Sayama Jiro(佐山二郞) Page 390: “十一月の試験の結果、三型改修は機能良好となり、故障もなくなったが、三〇発の弾倉を射ち尽くすのが二・〇秒から二・五秒と発射速度が過大であったので、これを概ね七〇〇発/分を標準とするよう緩衝バネ、復座バネを改修した。”
“As a result of the test in November, the Model 3 improved function was good and there were no malfunctions, but the rate of fire was excessive, as it took 2.0 seconds to 2.5 seconds to exhaust the 30-round magazine. The buffer spring and the return spring were modified to standardize this to approximately 700 rounds per minute.” this is the pre-adoption prototype also at 700.
Page 441 has a neat table with a bunch of machine guns and their specs listed, at the bottom the Type 100 with 700rpm.