Representation by population is a principle that the number of seats in the House of Commons should correlate to a ratio of the population. That ratio does not mean that an increase in population should reflect an increase in seats if the ratio can be amended to include more Canadians under one MP.
For example, three ridings over a region with a population of 30,000 will have a ratio of 1:10,000. If the population spikes to 50,000 with one region getting the majority of the newcomers that does not mean a whole new seat needs to be created. Three new ridings can be imposed that have a new ratio of 1:~20,000. The principle of rep. by pop. is maintained and the state does not bear the burden of extra costs for creating a whole new seat. Sure that MP has to represent more people but in our digital age connecting with people can be done on a larger scale than in the past with a little innovation and creativity.