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Personally, I would not put a lot of faith in any of the simulators. They just don't take everything into account. I've had them predict fairly accurate for me at times and other times they are way off. With that being said and looking at your scores. I suppose its possible you may make it or at least get closer.
Simulators are trash. Ignore them IMO.
One of the biggest constraints to a perfect 850 Score 8 is usually AoOA or AAoA, which typically need to be 17-18 years and 7.5-8 years, respectively. Assuming you've got that covered, an AoYA of > 12 months is also pretty much a requirement as far as I know. I'm not sure if there have been 850 scores reported with an AoYA of < 12 months, but would love to hear about it if so. That being said, if you're doing a loan refi, that will be resetting your AoYA to 0 months, thus preventing an 850. Also in opening that account it sounds like you'd be raising your installment loan utilization (something that may or may not adversely impact score based on your profile) and presumably would be taking on an inquiry as well. The chance is also there depending on where your AAoA sits that the new account could cause you to cross a threshold, possibly reducing score more.
If your AoOA isn't 17-18+ years and your AAoA 7.5-8+ years, an 850 would still be out of reach with AoYA reaching 12 months.
Where will those factors be for you in 6 months time?
The current known thresholds aren't necessarily gospel, they're just the lowest we've seen reported.
I'm not sure where I'd be with a prettier file as we can't really quantify how much damage a CFA is at this point but without a new account, without 3 inquiries, and without a CFA I'd be above my current 827 and I'm still a month or so shy of 5 years AAOA and an oldest account at 11 years: I'd be closer for sure, but maybe not perfect.
File age breakpoints are known in general but not in specific, it's a hard thing to concretely test for TBH. I don't think you'll likely hit 850 with just where my own profile is, but nobody can say for certain.