GF: Is it possible for researchers with the status of long term residence in the EU MS/AC, who are at the time of the deadline not active in the EU MS/AC to apply for a GF?

In the Guide for Applicant and in the H2020 Work Programme, Long-Term Residence means "a period of full-time research activity in the EU Member States or Horizon 2020 Associated Countries of at least 5 consecutive years".
We can confirm that for a Global fellowship, this criteria of Long-Term Residence is indeed a floating period of 5 years without time limit in the past. So yes, a LTR currently active in a third country can apply for a GF.
(The same floating period approach for LTR would also apply for the Re-integration (RI) fellowship, which is designed for fellows who must move of have moved from a Third Country directly to the MS or AC where the beneficiary is located).