"If a TSC member is no longer able to perform the TSC duties, the TSC member may inform the TSC via an email to the TSC email list."
Subsequent items in quotes are from the charter.
What we have here is more a case of abandonment than resignation. The charter does not cover this case exactly.
Do one or more TSC members believe that this is a Major TSC Issue?
"Major TSC issues may only be resolved at a TSC meeting except that the voting shall be electronically."
Does the TSC agree that the criteria for "Replacement of a TSC member" has been satisfied, and "an election for the position is held within 30 days of notification to resign. The conditions of the election are the same as for any TSC election." ?