I update my products weekly and I'm still stuck on this too. Turbo retargeting is $49 a month - this should happen organically as the spiders crawl through and update. imho.
I STILL have products on my FB page that have been sold out for months.
I tried shutting off the Shopify-side of it but it doesn't work after wating a week for it to update. I'm now trying to shut-down the FB side of it for a couple of days. I'm leaving the shopilfy-side off too. I'll reconnect it and hopefully it will work.