I don't think that's what it means? It means we don't have any players with an expected 100% chance of scoring during the game?
Also looks like we created only 1 chance of any sort from the 50th minute to the end of the match, which we duly converted. Looks like that chance had an XG of 0.4 I know lower league players are rated with lower XG due to their perceived lower ability but are they really saying Gordon is only going to stick that chance away 4 times out of 10? This isn't about individual player ratings (since I think they are well off whack anyway) but each chance is supposed to be rated for it's likelihood. I'm pretty sure a penno is 0.8 on most models, so I don't really know how they get to 0.4 for that chance of Gordon's, it was at least as easy as a penno surely?
Edit: Question answered:
Looks like the data comes from some sort of analysis of text output of a match report stream, that is not really convincing data for me to think this stuff is anyway closely analysed.
Edit again: This looks like what he may have used:
Goal!
Posted at72'
Goal! Lincoln City 2, Forest Green Rovers 1. Kellan Gordon (Lincoln City) right footed shot from very close range to the bottom right corner. Assisted by Shay McCartan.