This has been discussed in general threads (not this specific Canadian thread).
Consensus is that:
Tesla aggressively sold off the loaner fleet to make 2015 revenue numbers better.
Tesla moved CPO into loaner car fleet in early 2016.
There are two other alternative explanations for Tesla's *motivation* for changing the loaner fleet -- a long-term explanation, rather than a "juice the numbers" explanation:
#1:
Tesla decided they didn't want to have top-end new cars taking fast depreciation on their books in the loaner fleet.
They decided to populate the loaner fleet with low-margin depreciated CPO cars which lose them a lot less money as they depreciate.
They moved the existing loaner fleet into for-sale inventory to make this rotation and stop losing money on the depreciation of the loaner fleet.
#2:
Tesla's previous scheme of having new cars in the loaner fleet involved the loaners being available for sale. They were constantly being sold, and making it hard for the service centers to consistently supply loaners.
Tesla decided to keep having these new cars available for sale. Tesla instead created a new loaner fleet which was *not* for sale, so that they would be reliably available, made up of CPO cars which would otherwise be low-margin for Tesla.
I think these are both true. It's not really Tesla's style to "juice" the quarterly numbers. These are long term strategy decisions which are wise.
Either way, the result is that Tesla dumped the former loaner fleet into "inventory" and pulled most of the CPO fleet out of the for-sale inventory to become the new loaner fleet.