Another way is use the text pt and make a polygon can be just 4 sides a few more sides can work better, then get its co-ordinates, then erase (entlast) a simple (ssget "CP" co-ords (list (cons 0 "TEXT")(cons 8 layer))) this saves searching through the other text selection set.
(command "ploygon" Pt "I" rad)
(setq co-ord (mapcar 'cdr (vl-remove-if-not '(lambda (x) (= (car x) 10)) (entget (car plent)))))
(command "erase" (entlast) "")
(setq ss (ssget "CP" co-ords (list (cons 0 "TEXT")(cons 8 layer))))