FFTactics
Those rumours come from the same type of FF fans, that's why it's obvious bullshit.
Also the fact that SE said IX would be more work to Remake like VIIRemake due to its intentional artstyle and making sure it's faithful.
That's when the rumours changed to being a lower budget faithful Remake..
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The only hint of another Remake that's come from Square in interviews is VIII and even that was a big IF from them and they said would be a long way off if it was to happen.
They even mentioned stuff they would like to do in a VIII Remake, so they obviously been thinking about it
Fun fact - what further cemented it was FFVIII Remastered for current gen was ment to be like FFVII & FFIX ports but the Remake team interfered and wanted to enhance it more and was getting carried away with it and had to stop and return to FFVII Remake to work on and that's why we got a Remastered Version and Physical Release instead of a Mobile port like IX got.
I wouldn't be surprised if there's already concept artwork for a FFVIII Remake.