Well, the first thing to note is that the numbers are for MSM - men seeking men. That includes men who identify as straight, bisexual, or other, but who have sex with other men. You may not consider this much of a distinction, but for people who study this, it changes things significantly.
And for straight men who don't want to have sex with other men, it should still be a concern when over a quarter of new infections are suspected to be due to transmission during heterosexual sex.
And for straight men who don't want to have sex with other men, it should still be a concern when over a quarter of new infections are suspected to be due to transmission during heterosexual sex.