Context for anyone that isn’t Canadian or has not seen the House Hippo PSA:
Concerned Children’s Advertisers (defunct) ran many ad campaigns in Canada focused around kid’s health and other related topics like bullying.
The House Hippo was one of their ad campaigns running from the late 90s to the mid 2000s and, at the time, would have been as well known as something like “Timmies”.

Because DE is located in Canada, there’s a good chance that many of the staff know of or even grew up seeing the House Hippo PSA.