As long as it will show as a college class on his transcript from the college, it should be transferable according to the policies of the school he transfers it to.
Be aware that some colleges may not accept transfer credit for college courses taken while in high school, or may not see the course as exactly equivalent to its own course (e.g. frosh/soph physics courses often cover topics in a different order at different schools, so a transferred physics course may cover bits and pieces of different physics courses at the new school).