That way is inner representation of data in TradingView, so it can be changed any time. It's just an example of requesting of the data.
Description of the series.
time: report date (unix time stamp)
open: estimate value
low: reported value
close: actual value
high: fiscal period (unix time stamp)
time: split date (unix time stamp)
close: split denominator
open: split numerator
time: ex-dividend date (unix time stamp)
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.