Is does not return a boolean

SELECT 
routine_schema, 
routine_name, 
pg_get_function_identity_arguments(translate(substring(routines.specific_name,'_[0-9]+$'),'_','')::int::oid) AS parameters,
data_type AS return_type, 
is_deterministic, 
routine_type,
security_type,
external_language,
regexp_replace(pg_get_functiondef(translate(substring(routines.specific_name,'_[0-9]+$'),'_','')::int::oid),'[\r\n]','<br>','g')  AS routine_src
FROM 
information_schema.routines
WHERE routine_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL) 
AND external_language IN ('PLPGSQL','SQL') 
AND routine_name NOT IN ('f_assume_you_must_use_files', 'f_check_format_comma_separated_list', 'f_check_password', 'f_default_value_with_no_match')
AND NOT EXISTS (SELECT 1
FROM pg_catalog.pg_depend d inner join pg_catalog.pg_proc pc ON d.objid=pc.oid
WHERE EXISTS (SELECT 1 FROM pg_catalog.pg_extension e WHERE d.refobjid=e.oid) AND
pc.proname || '_' || pc.oid = routines.specific_name)
AND (data_type<>'trigger' OR data_type IS NULL)
AND data_type<>'boolean'
AND routine_name~*'^(is|has|on)_'
ORDER BY routine_schema, routine_name, parameters;