Canuck do you have from your perspective as knowledgeable in the field of law an understanding of what type of legal advice Tesla have been given (As an US company I will assume that the legal department in Tesla (or external advisor) have been directly involved) prior to the changes that in fact have been done on their web site with regards to HP numbers.
First change: Removing any trace of a combined number of HP motor power (the infamous 691.) and just giving the HP motor separately for the two motors.
Second change: Start referencing to the R85 testing standard
Third change: Include information of 1 foot roll out on their 0-60(0-100 numbers much later in time in Europe) numbers.
Fourth change: Post a technical blog explaining HP numbers but omitting actually state the battery limited HP number for the model in the lineup that actually are limited by battery power.
Fifth change: Include the battery limited HP number of the actual vehicle in addition to the separate motor HP number.
I don't think the "changes" you describe are enough. If Canuck was to represent Tesla's side, he would need to know internally what drove those decisions, not simply the results which can be open to interpretation.
For example, here's my interpretation:
1) That number was pulled in May response to the 691hp thread saying it was misleading. That does not mean Tesla thinks it is wrong, simply that Tesla is listening to customer complaints (they perhaps thought this would let the thread "die" as some expected it would).
2) The R85 standard was actually referenced since *before* the P85D and other dual motor cars came out. This was not something Tesla pulled out afterwards.
http://www.teslamotorsclub.com/show...or-P85D-and-P90L/page81?p=1229983#post1229983
3) This can be interpreted as clarification, not a correction. Ultimately they have not changed their 0-60 numbers advertised (and as has been pointed out many times, US automakers tend to advertise this way by default).
4) Much interpretation has gone into this, but it can be very similar to #1. Stating the battery-limited number may be interpreted as the 691hp number being "wrong" (which some have done exactly that in this thread), so Tesla had avoided doing so for the P85D all this time.
5) I expected actually Tesla not to do this until after there is some kind of material change (like a new motor or new SAE rating standard), but they did (but did so in a way that kept "motor power" going and still as the primary metric). Again similar to #1, this may simply be Tesla listening to consumer concern (again perhaps it will let the thread die as some also predicted when this happened), not necessarily them admitting fault.