oriental roaches live in drains and sewage systems, cannot climb walls, and move very slowly because they eat a low nutrition diet of sewage. so, they are both the grossest type of roach and the easiest to deal with.
as i am not an etymologist., and bugs can be difficult to id, there was an initial point of less than certainty. but, it was a short amount of time before i was certain about it. and, looking back, there is really no ambiguity.
further, it's not like the property owners denied it - they were forthright about it, and willing to work with me to help me contain it. they claimed they were 'american roaches', and i did see a couple of roaches that i think were german, but i was able to deal with them by blocking holes in the electrical heating. these ones were faster and more reactive to stimuli; they would jump into holes in the wall before you could get them. i was there from mid-2013 to late 2017, and i don't remember seeing these roaches - at all - after the first few months of living there. the steel wool worked like a charm.
the ones that kept coming back were the orientals. what the property owner told me was that they came in through the sewer lines, which were open in the back room. i was able to get a look at it at one point, when i finally forced them to get an eel in to clear the drain, and it's some kind of ancient system that is really an open sewer. i agreed with the analysis, but i was convinced they were coming in around the back of the unit, rather than under the front door.
we decided that it would be best if they let me deal with it, i just requested that they buy me the pesticides. so, i'd ask for some more spray every once in a while and liberally go over the back spaces with it.
there's quite a bit of documented evidence over the course of the vlog - i kill roaches, take pictures of their dead bodies, etc. i'd invite some analysis. but, it's not an open question, and not a debate i had when i lived there - they readily conceded the point.