Using ctid in delete statement

Hi,
is it safe to use ctid in following query? :

DELETE FROM table_name WHERE ctid = any ( array ( select tn.ctid from
table_name tn JOIN items i on tn.itemid=i.itemid WHERE tn.clock < extract (
epoch FROM now() - i.history * interval '10 day')::int + 6 limit 100));

Could I be sure that ctid will not change during the execution or will not
do any harm to other transactions?

regards

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