Yes, after suspension in course user would not access to the course, could not see activities in it. But all grades and his completions statust for activities in this course would be preserved.
And when susprnsion for the user would be removed grades would be available for the user again.
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Or maybe the user can be, somehow, suspended in cohort, (not removed from cohort = loosing all grades in courses).
I couldn't find this sort of thing.
General help
User migration between cohorts
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