I have also heard that, but I have not tried it. I would tend to think
that it would work if the mix was not too strong and allowed for movement,
which is the beauty of sand. As it freezes and thaws or moves in other ways
the sand adjust. If repairs are needed a brick or as many as needed can be
removed and reset.

I think that you should take out the bricks, and pour an 8" thick
monolithic slab with rebar and fiberglass, and stamp and die the top
to LOOK like brick.