Yeah there is an article about that in Wiki tooPreGreek substrate The ulis suffix however poses no problem to include it as an IE suffix you will find such suffixes throughout IE and they are traced back to PIE Latin ula Alb ull Greek ule kotyla in Slavic there is protoSlavic sedulo Germanic sadulaz English saddle etc etc In Greek ulis does not appear to be that common but ule arbule is common enough If someone were to collect all the ulis examples in Greek you probably wont find any indication of a preIE origin for it and even a Thracian or Illyrian origin may not fit the data Its probably native to Greek or some Greek dialects In the case of bombylis and arbylis bomb here means bubble or some such Greek pomphos bubble and such forms are found in IE French pompon of obscure origin  nonIE I think while arb meaning curved arched may also be IE I just havent checked yet Anyway these Greek suffixes dont prove that it is also a suffix in Bardylis but thats more likely than a twoword compound