Japan's Advanced G-RX7 / Type 18 Heavyweight Torpedo

Thanks for info that the torpedo counter counter measures (TCCM) function of the newest Japanese torpedo designs isn't from American designs because Japan's heavyweight (HW) torpedos are much newer and more advanced than the US (and by extension Australian) Mk. 48 HWs.

That Japan basically reverse engineered legally transferred US Mk. 46 lightweight (LW) torpedo TCCM technology for use in the [up to 2020 current] Type 89 Japanese HW torpedo.

So Japan's G-RX7 (aka Type 18) HW torpedo is replacing Type 89 HW.  You advise the G-RX7 represents an upgrade in every way (more advanced TCCM ("based loosely on the Mk.46"), quieter, and longer range, can hit deep and shallow targets (subs and ships respectively).

So the G-RX7/Type 18 torpedo is "the most advanced large torpedo in the world currently" [Pete Comment: This side of what is known or unknown about Chinese and Russian HW and LW torpedos...?]

Japan has quite a history of torpedo advancement [eg. the 24 inch Long Lance/Type 93 torpedo https://en.wikipedia.org/wiki/Type_93_torpedo] with tech transfer to Germany in WWII.

Since Japan is advertizing how good the G-RX7/Type 18 HW torpedo is I'm assuming Japan will/has tech transferred it to the US?