People were speculating that the witness testimony was suspicious and carefully worded, so as to avoid certain phrases. (Like avoiding saying decomposition, so the defense couldn't press them on it.) If they were purposefully NOT accurately describing their smell, that's perjury. If they didn't really smell something and later claimed they did, that's also perjury.
I think a smart, informed witness, would avoid using the word "decomposition" to describe an odor coming from a deceased person that had been dead for five hours. IMO
That wasn't the speculation, though. The speculation was that LE formed the opinions of witnesses for them.
My comment was in reply to the BBM in your post.