Yup yup, only unperked turrets.
I actually did think about the combined arms DPS though and I tested this a good number of times. When I ran my tests on this I did not get that result UNLESS I also skilled into the other weapon significantly. Baseline AK + 2 turrets for instance took me longer to kill 25 feral bikers (there with AI turned off just to be a wall of meat) than fully spec'd AK. Same T6 AK with same mods. Weapons get massive damage, headshot, and reload bonuses with their skill ups so when you're using the baseline weapon and then losing half your firing time due to reloading turrets you end up losing alot of DPS.
This DPS loss from the reload placement downtime and turret placement time was so significant that Fully spec'd AK DPS + 2 fully spec'd turrets only ended up killing the grouping about 20% faster. So the "2 turrets + AK" sounds more effective on paper than it is in practice. But without dedicated testing there is so much going on it's really difficult to understand how well you're doing. Especially with all the differing variables in the normal game outside of controlled testing scenarios.
It should be noted that I did not use AP ammo in these tests either, AP ammo would have further benefited specialist AK over baseline AK + turrets.
*Edit: I should note that all ammo found is bonus for horde night but that scrap is not free. Doing my current full int play through for power curve testing purposes I just finished Day 26 horde and I used 3,000 junk turret ammo, 300 shotgun ammo, 500 AK ammo, burnt through my electric fences and finally ended up killing the last 50 with stun baton while tanking the damage via fortbites and healing (to prevent them from breaking through my last block).
Iron is cheaper, but not free and 3,000 junk turret ammo is 9,000 iron. I still spent 500 7.62 and 300 shotgun shells on top of that. Instead of mining for lead I'm mining for iron instead lol. I have more brass than I know what to do with but I can barely keep enough iron on hand by mining at night to keep those turrets fed for normal use + horde night

. I'm going to have to sacrifice a full day to mining soon to get the shotgun ammo I need to fuel my shotgun turrets because the night mining is all desperately trying to get the 15,000 iron I'm going to need for my next horde night's junk turret ammo even as I spend some of that ammo via POI scavenging.