"The markdown datatype is restricted to the Scalar table." is not valid anymore. You are now able to have sliced markdown tiles. You must however use Slices table.
The value of alpha in this example is very high. I would suggest to use a value close to 0.05 (depending on how much you want your sales are correlated).
Langserv may suggest to use join(T.A, G.S) instead of join(T.A; G.S). One must use a ; and not a coma.