Earlier quoted context omitted.
Given Smule's apparent lack of interest in investigating whether their allegations have merit, it seems a little hard to imagine that their side of things actually does have merit.
How can you declare their lack of interest in investigating - the Medium post is 2 hours old. If you think that its simply a case of not using your old employers code then you're naive (See: The Social Network). FTR: I'm not on either side here but I'm unsure if this blog post was the wisest move.
Both by Shred's account and Y Combinator's, Shred has repeatedly offered to submit their code for third-party review to see if it is copied from whatever Smule thinks it's copied from, but Smule has declined every time ("claiming, although they most certainly know better, that Shred could have successfully obfuscated their code making such a review useless," per Geoff Ralston's post).