There was never any rumor like that. The rumors or better said actual slides like the one i linked dealt strictly with core counts. There was no mention of MESH until maybe 2 months ago:
http://wccftech.com/intel-skylake-x-skylake-sp-mesh-architecture-interconnect/
Just for the recapitulation:
Intel originally released info, which pointed toward the possibility of 10C being the top Skylake-X consumer part. Its on that previously linked slide.
Later, rumors came up, that the top HEDT chip will actually be 12 cores, not just 10C. This was reinforced by this photo:
This is the first mention of 12 core Skylake-X part, although as you can see, its properties were unknown yet, which kinda makes it look like afterthought, not surprising given the original Intel slides.
At this point of time, there was no talk about LCC and HCC and whatnot, this stuff came into light later when the whole line-up up to 18C was revealed . There was a bit of confusion, whether 12C will be still LCC, or already HCC, which was later definitely put to rest with the Mesh info.
Finally the Computex slide:
Threadripper was officially mentioned by AMD for the first time on 16th May, 2 weeks before Computex.
http://www.amd.com/en-us/press-releases/Pages/amd-unveils-expanding-2017may16.aspx
this is how it all happened to my knowledge. You are free to dismiss it as fake.