Seems app-admin/lsyncd already migrated from deprecated lua 5.0 functions, dev-lang/lua:0[deprecated] has no use.
Don't you mean >=app-admin/lsyncd-2.2.2?
No, app-admin/lsyncd-2.2.3 depends on lua-5.2[deprecated], and this is another story. Maybe it can dropped too, but for now I can't validate it due lua-5.2 is masked.
2.2.3 is stable, maybe we can cleanup old?
I guess, we can closed here, as current version is 2.2.3 and all others are dropped. Also EAPI=6 is gone. It uses slotted lua, so it does not depend on dev-lang/lua:0[deprecated].