each employee provides $2.3 million worth of value

Market cap is just the value at which shares are sold on the market, not necessarily the actual value of the company. They imply a lot speculation for investors on how much they expect to gain from the ownership. The company equity/net worth is a more accurate indicator. What you’re calculating is the accumulated value in time, not yearly.

If you want the ratio of generated value to wages paid, it’s hard to accurately calculate with just public data, but you can approximate it so: in a given year, take the operating income and divide it by the number of employees. Operating income accounts for overhead expenses like SG&A (Sales General & Admin), which includes things which you can argue are useless (like wages for execs, middle management, and sales), but they also include admin costs like office rents, etc. Then you also have to find the average/median wage of a worker at the company, so the total is:

yearly value created by a worker = (operating income / n. of workers) + median wage

You can also do a quick calculation using this tool: yourfairshare.info

It’s interesting to note how in all of these top companies, for every 1$ paid to workers, another ~1$ is transferred to capitalists.