US ($339k): https://www.levels.fyi/companies/facebook/salaries/software-...
UK ($200k): https://www.levels.fyi/companies/facebook/salaries/software-...
Lower COL does not make up for $139k USD.
I've seen this exact conversation happen on /r/cscareerquestions about US salaries an uncountable number of times. COL never makes up for the salary difference on the high end. Maybe for median and below salaries, but never for the top percentiles.
E: since you edited in stuff about remote work, I meant in the US. There are a lot of US companies that allow remote work within the US now. I was also talking about SV vs everywhere else in terms of salary difference, not COL. Even with a salary reduction, you're most likely making more than you 'should' in a LCOL area.