cherrybim: It specifically says he allowed his family while the CC himself didn’t. I only addressed the latter above. And I would shake with fear before C”V accusing the CC of having a minhag shtus.
As far as the Steipler — see Orchas Rabbeinu 2:49 page 50. He too didn’t eat gebrochts. Nor does Rav Chaim shlit”a. And Rav Yaakov Kamenetzky’s minhag was not to brok. See B’mechitzas Rabbeinu p.137.
I suppose the Chofetz Chaim, the Steipler, Rav Chaim shlit”a, and Rav Yaakov all had a “minhag shtus” according to your description.