HOT and OSM have slightly different aims but HOT does build on OSM. There are mentions of OpenStreetMap wiki and learnOSM and the O in HOT is OpenStreetMap.
Having said that adding something along the lines of "OpenStreetMap is the volunteer-driven open data mapping platform which makes all of this possible, supported by the not-for-profit OpenStreetMap Foundation." even at the bottom of the first page would be helpful. I accept that HOT has created a number of tools that conventional mappers use. LearnOSM has benefited from input from HOT members and I suspect some of the imagery that is now available to armchair mappers has its roots in HOT but the quality of mapping from some of its "disposable" high turnover mappers does leave much to be desired at times so an acknowledgement of OpenStreetMap's role would not be out of place. Cheerio John
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