This is the silliest/strangest story I have heard about a Rav Kanievsky "miracle" in a while... the article actually has a few, but I am pointing to one of them in particular..

Kikar is relating the following story as a miracle performed that occurred as a result of a bracha by Rav Chaim Kanievsky..

A yeshiva bochur in a top yeshiva was having difficulty finding a spouse. He went to Rav Kanievsky for a bracha and even told the rav that he had been there previously and has done everything recommended by the rav yet is still having difficulty and has not yet merited to get engaged and married.

Rav Kanievsky, instead of giving him another bracha or set of instructions, wondered aloud increduously " what do you expect me to do - tell you to go to the roof and jump  up and down a thousand times"?

This bochur actually went up to the roof, jumped up and down a thousand times. Lo and behold, a week later he got engaged!

I do not know if this is an amazing story of emunas chachomim, a silly story or just a weird piece of fiction...