I am not sure if this answers your question, but here is my idea about M/As. Yes, they do indicate the direction of a trend in whatever timescale you are observing, but so do many other tools. Best of which is "PRICE". A M/A dilutes the information contained in PRICE and maybe makes it easier for the human eye / mind to intrepret.
Of course no moving average of any type will give an indication on whether a trend will continue.
Maybe used with other tools it could be a useful component of an approach or method, but this is going to be more of a function of the trader utilising the approach as opposed to any benefits that M/As may offer.
It can indeed, provided of course that the time period concerned is in the past and not the future. Moving averages in combination with other moving averages and/or in combination with other technical parameters and other interpretation based on understanding the price-movement tendencies of the particular security concerned can give varying degrees of probability of trend continuation in the future too, but certainly not an "accurate indication". IMHO.
I think he's referring (and DO stop me if I'm mistaken Tony, but I think I'm on safe ground here <g>) that a non-past time based MA must be based in the future, and for you to consider that it might exist in such a matter of fact manner suggests we could all benefit hugely from subscribing to whichever data supplier you are getting this future price feed from.....
I'm beginning to think that - in the words of a certain Professor of Classics who, secretly, was sadly unable to translate substantial proportions of the original Greek - "the passage loses more than it gains from an excessively detailed analysis".
It can give you a pretty good idea, but is unfortunately still a lagging indicator, so whipsaws are a painful reality here. It works nice however as a tool in you Technical Analysis but not a great on shorter term trading signals.