Interesting bit of writing, although it might be more enlightening if they'd compiled some stats about Saka's output versus his cumulative minutes, or versus some sort of moving average of minutes played.
The main argument it makes is that Saka's dropped off in form since the start of December, which sounds about right.
Last season Saka experienced a steep drop in form midseason, one that turned into an extended trough. That happened hard upon the brilliant performances for England which saw him finally properly anointed as a national superstar by the pundits.