On this link it says
"Nobody, so far as I know, disputes the general accuracy of Memri's translations but there are other reasons to be concerned about its output."
So it doesnt claim the translations are inaccurate
This is the standard article that is used to try to dispute MEMRI but it does nothing of the sort and says it is accurate. It is all baseless spin. It also had to print a correction at the end of the article for a false claim it made.
This article only says there is a dispute about one of the translations