Me thinks this article has gaping holes in it, too many to even talk about.
For one the Bacteria in Activia is patented aka GMO, second it is Aluminum terminating and therefore will throw off the ALU balance in the gut and get rid of any remaining yttrium terminated bacteria.
See Orlee on that; Minerals for the Genetic Code
Also once gut flora is heavily ALU terminated yttrium cannot take hold, think of a Sodium:Potassium balance.