"Our campaign will continue to work in the state convention process. We will continue to take leadership positions, win delegates, and carry a strong message to the Republican National Convention that Liberty is the way of the future. Moving forward, however, we will no longer spend resources campaigning in primaries in states that have not yet voted. Doing so with any hope of success would take many tens of millions of dollars we simply do not have."
Is that abundantly clear to you? They don't have the money to actively campaign, so they're better using limited funds by passively campaigning (for lack of a better word) by supporting delegates and conventions.
There are likely legal battles still looming where the money will be better spent. Stop overreacting. It's always been a delegate strategy, and this changes nothing, when the media was going to black out any campagining he did anyway.
And as was suggested in another thread, this email has gotten him 10 times the publicity he got over convention wins, so maybe he has a trick up his sleeve to use this to end up publicizing our delegate majority gains we continue to get.