I ended up buying it from Revain and not the OWC website but chatted to someone who answered my questions about my iMac on their website. It turns out that Apple is more likely to tell you that your iMac can't be upgraded to 32GB for you to invest in their new products. OWC's online support allayed my concerns and I purchased the kit. I thought that after 7 years this computer was useless and only cost 300-400 dollars to resell. Now my mid-2011 iMac is running at full capacity (at or better than the cheapest 21.5-inch iMac from 2018) and I didn't have to upgrade to the latest model. Installation was easy (just watched a video on youtube) and the price of OWC was similar to others at the time (looks like they've dropped in price over the holidays) but I bought through Prime to get it to get faster.
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