Rendered plinth around house

the cement cracks and traps water against the brickwork creating penetrating damp, cement all the way to the ground through capillary action sucks moisture up from the ground creating rising damp. so in short its not a good idea. N.H.L. mortar allows the building to breathe allowing moisture to pass through stopping water getting trapped stopping damp, there are no additives or cement in N.H.L. mortar

Rendered plinths are no longer a good idea in any form, most cover the existing DPC of which cause bridging to the course and becomes ineffective when in contact with the ground. Rendered brickwork must fall to the DPC and the remainder exposed, this can be covered in a bitumen based material for protection or decoration.

In my professional opinion rendering of any type below your dpc is a mistake and will inevitably get problems the best solution is to stay above your dpc using a bell cast bead deflecting water away from the wall any time served plasterer would fit these to the correct height