I cannot find any information about this specific instance. However, here is what I think. First one is using a sort of shorthand by writing restriction(s) instead of writing “either restriction or restrictions”.
Second, if you agree, then this question is answered by the following grammar rule: When two subjects differing in number are connected by either-or, and one of them is plural, it should be placed second and the verb should agree with it. By the way, The Elements of Grammar by Margaret Shertzer is a wonderful book on grammar, and I found the above in it on page 22.
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Is it correct to say: “I like those ones.” Or is it ever correct to say “those ones” in a sentence? Also I offered somone a good bye by saying, “Drive safe.” Is that ever correct? Or should it be “Drive safely.” And if you have time for one more. To say, “She had went to the store.” The better way to say that is. “She went to the store.” But, is that ever correct?