The OP may be right that the sub two attempt took a bit out of him that may have cost him the record today.
And you can only be in record shape for so long.
London 2:03:05 may wind up being his lifetime PR.
But a lot was learned from that sub two attempt that future runners and coaches will learn from.
And Kipchoge will long be remembered for that event vs how well actual record holders fame holds up.