The statement lacked any detail. It's just attention whoring.
The US is conducting nuclear tests periodically just like other nuclear powers. Subcritical nuclear testing is allowed.
The last one was in 2024 https://www.energy.gov/nnsa/articles/nnsa-completes-subcriti... "NNSA successfully executed a subcritical experiment in the PULSE facility at the Nevada National Security Site. The experiment was executed in partnership with Lawrence Livermore National Laboratory."
The US is conducting nuclear tests periodically just like other nuclear powers. Subcritical nuclear testing is allowed. The last one was in 2024 https://www.energy.gov/nnsa/articles/nnsa-completes-subcriti... "NNSA successfully executed a subcritical experiment in the PULSE facility at the Nevada National Security Site. The experiment was executed in partnership with Lawrence Livermore National Laboratory."