Two ICSID Arbitral Tribunals, on the basis of similar reasons, reached the same conclusion: Achmea decision (available here) does not affect their jurisdiction.
In a nutshell, this is the principle laid down in 9Ren v. Spain (final award of 31 May 2019 available here) and in Rockhopper v. Italy (partial award of 26 June 2019 available here).