Not to mention, if they're using a cable wifi gateway, the ISP can traffic shape them. I had the Comcast xfinity tower thing when I first switched, all my devices topped out at 10Mbps upload even if it was the only thing connected at the time. Swapped it for a surfboard and my own x86 router using openwrt and topped out at the max (at the time) 40 Mbps.
Maybe they're confusing the mask with the Kathy Griffin photo from years back?