Keep up Ian , Phil E posted the FINAL version
But you are quoting from this
http://www.rugbyrefs.com/attachment.php?attachmentid=3660&d=1513159224
...its NOT a final version, its a draft...have a look at the top of every page underneath where it says "Simplified Law Book"
As for your assertion that the Cavalry charge definition has changed, it hasn't
[LAWS]2017 Law 10.4 (o)
‘Cavalry Charge’. The type of attack known as as a ‘Cavalry Charge’ usually happens near
the goal line, when the attacking team is awarded a penalty kick or free kick. Either a single
player stands some distance behind the kicker, or attacking players form a line across the
field some distance behind the kicker.
These attacking players are usually a metre or two apart. At a signal from the kicker, they
charge forward. When they get near, the kicker tap-kicks the ball and passes to a player who
had started some distance behind the kicker.[/LAWS]
[LAWS]2018 Draft laws General Definitons
Cavalry charge: An illegal type of attack, which usually happens near the goal line, when the
attacking team is awarded a penalty or free-kick. At a signal from the kicker, a line of attacking
players charge forward from a distance. When they get near, the kicker taps the ball and
passes to a player.[/LAWS]
The wording is different but the meaning is identical
The Cavalry Charge has
always been about one person receiving the ball. The Cavalry Charge is illegal because there are several players charging but only one receives the ball, and the opponents are put in a position of having to risk being penalised for tackling opponent without the ball. So long as a player is on his own and not in a line-up of charging players, he is allowed to revieve a pass from a tap kick while he's running towards the opposition.