I think the conclusion is speculative at best, and likely based on some imaginary extention of the act of disbanding voter turnout teams. What Trump has been accused of not doing well is "delegate fluffing and turnout." That is independent of the actions relating to getting votes in primary and caucus contests.
According to the story which was on radio he is firing all of them after the primary. This was not imaginary. This was reported by people inside his campaign who were amazed that this was happening. This does not lead to ‘fluffing’ but no fluffing at all and no local ground game - zero.
Wish I could point to a written account but while there may have been one, I did not stay tuned long - was in traffic at the time.