This form of introduction of a stipulation is better than provided without the that and much better than providing. The phrase should be reserved for a true stipulation, as in:
He said he would go to the meeting provided that I went with him,
and not used loosely for if as in:
I expect he will come tomorrow, provided that he comes at all.
Sometimes this misuse of provided that creates difficulties for a reader:
Such emoluments can only count as qualifying for pension provided that they cannot be converted into cash.
The use of provided that obscures the meaning of a sentence that would have been clear with if.