The votes cast at Guelph were cast under the special voting rules, not the rules that apply to a regular polling station. The votes were cast in a manner that respects the special voting rules.
The use of the special voting rules in circumstances that are outside of a returning office or military voting place is something that is done occasionally. For example, it's used by workers in remote working areas and in hospitals. It has been used for a long time. Because of the different nature of the rules that apply, we do not use it broadly and we do not use it without consulting first with the candidates and the political parties that would be affected by the use of those rules.