Well, that's quite logical since that site can't know you contributed anything... Anyway, if you go to 'My account' and then click 'New position' (under 'Experience'), you can add yourself to CHDK, specifying no committer name... if I read it correctly. Maybe that'll list you in the contributors-section.
Enter the project you worked on. If you've committed to an open source project directly, make sure to enter the alias you used to make the commits - we'll automatically track metrics for you. If you have not committed directly to the repository, just leave the Committer Name field blank.
Oh yeah and it says the cost is probably off for 'small', 'young' projects with 'little activity'. 370 changesets isn't that much, I think. Also, the effort calculation is probably way off due to the amount of largely copypasted ASM code... I think it's quite impossible to generate 27 person years of work with 9 contributors in one year