I believe this might be a personal vendetta type of story due to political reasons.
But you can never rule out the possibility of fixing even if it's a small percentage of chance. There is a lot of corruption in SL cricket and you add Pakistan's name with the pinch of fixing allegations. Interesting recipe to raise a few eyebrows, let's see.
These sort of allegations will have ramifications well beyond Sri Lanka and Pakistan. I still remember what happened when senior players such as Mohammad Azharuddin and Ajay Jadeja were convicted for match fixing more than two decades back. The BCCI tried to suppress the whole issue, but in the end, things spiraled out of control. A number of sponsors pulled out from deals with the BCCI and ICC and these bodies suffered significant monetary loss. And there was a large decline in TV viewership for live cricket.
If there is any truth in those allegations then it should come out in public after a fair investigation.
No matter who are the conspirators and they should be punished accordingly. Yeah, those times were pretty dark for Indian cricket, in fact, a fair amount of fixing incidents popped up at the same time in the cricketing world.