atomic_load/store_* appeared in NetBSD 9, not 10. Pullup preceded release of 9.0.diff -r1.5 -r1.6 src/share/man/man9/atomic_loadstore.9
(riastradh)
--- src/share/man/man9/atomic_loadstore.9 2019/12/08 00:00:59 1.5
+++ src/share/man/man9/atomic_loadstore.9 2020/09/03 00:23:57 1.6