Perhaps the type of a base table column should be BOOLEAN (based on column names)

WITH fk_columns AS (select target_schema as table_schema, target_table as table_name, a.attname as column_name
from (select 
(select nspname from pg_namespace where oid=c.relnamespace) as target_schema,
c.relname as target_table, 
c.oid as target_table_oid,
unnest(o.conkey) AS target_col
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
where o.contype = 'f') t
inner join pg_attribute a on t.target_col = a.attnum and t.target_table_oid = a.attrelid and a.attisdropped = false)

SELECT c.table_schema, c.table_name, c.column_name, c.data_type, c.character_maximum_length, 
coalesce(c.column_default, d.domain_default) AS column_default, c.is_nullable
FROM INFORMATION_SCHEMA.columns AS c LEFT JOIN INFORMATION_SCHEMA.domains AS d USING (domain_schema, domain_name)
WHERE column_name~*'^(is|has|can|on)_' 
AND (c.data_type<>'boolean') 
AND (table_schema, table_name) IN (SELECT table_schema, table_name
FROM INFORMATION_SCHEMA.tables WHERE table_type='BASE TABLE') 
AND table_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 NOT EXISTS (SELECT *
FROM fk_columns
WHERE fk_columns.table_schema=c.table_schema
AND fk_columns.table_name=c.table_name
AND fk_columns.column_name=c.column_name)
ORDER BY c.table_schema, c.table_name, c.column_name;