That can only mean that either investors have not been properly exposed to the claim and evidence or that they do not believe it. Nobody with investment money for high tech enterprises would turn down a working LENR reactor that they thought could be real. Makes no sense at all.
I can think of a bunch of highly sophisticated people who you could convince on the science but who still would never invest in LENR. Not because of fears about optics or anything like that, but because it's fiendishly difficult to make long duration investments in rapid technological change. Sure, it's possible, but not the way you think.
The argument that because there has been no investment there is therefore no belief in the technology, or that it is a mark against Mizuno / suggestive of the technology not being real is dubious.