It would seem so.
East Devon Election and Returning Officer Mark Williams (also CEO of East Devon District Council) rather grudgingly admitted that “things had gone wrong” at the last election but said it would not happen again in this newspaper article published today:

No mention of the fact that he was hauled in to a Parliamentary Committee to explain why he “lost” 6,000 voters (answer: because he thought his idea of telephoning missing voters was better than the government’s guidance of visiting them), was particularly noted by the Electoral Commission for not following those guidelines, or why East Devon was one of only SEVEN councils out of more than 400 to have made MULTIPLE mistakes. OR that he has been doing the job for years but still doesn’t seem to have got it quite right.
If it were a junior officer or councillor who had not been considered up-to-scratch (particularly an Independent Councillor) would he or she had got off so lightly?
Teflon-coated?