Speculation on forums...
nope, seems RPi mod has locked the forum, probably a good idea, judging by the 16 posts, which range from well argued to tin foil hat.
Anyone can make guesses at what has happened, but the truth is probably,
1. Hardkernel, we have worked hard on a clone of RPi, can we buy x of this SoC
2. Broadcom, yes, price will be = z
3. Hardkernel, we can't afford that price
4. Broadcom, ok if you buy 10x we can give you this price
5. Hardkernel, we can't afford that risk
6. Broadcom, sorry can't help
Perhaps RPi could offer to sell the quantities required by Hardkernel, but maybe RPi have T&C's that say they are not allowed.
The issue is probably better understood if we knew where the first batch of Broadcom SoC that Hardkernel used to develop their product, came from, was it Broadcom, a distributor getting rid of stock, bankrupt stock...
I could be wrong, but in the last few years RPi has pretty much followed the Arduino model - 'if you want to make it carry on, but don't call it Arduino'
I visit their website almost daily and they always IMHO are 'on message' with their mission about improving education in computer science and related subjects, the hardware whoever supplies it, is just another vehicle for this.