Jack’s utter ignorance of the basic rules of football is staggering!
Perhaps he ought to consider why no other media outlet has reported this.
As 90 minutes explains
“Section 10.2 of the official competition rulebook clearly states: "Where any match goes to extra time (in accordance with the provisions of Rules 14.4, 14.5 and/or 14.6), then subject to the League having obtained the prior approval of the International Football Association Board (IFAB) to the application of this Rule, each Club participating in that match will be permitted to use an additional substitute (in extra time only)."
Rules 14.4, 14.5 and 14.6 relate to the need for extra-time, and both Arsenal and City took full advantage of their right to use a fourth substitute during the additional half hour.
Perhaps where confusion initially emerged was that the Premier League pair made two substitutions each during extra-time, with City also making one at the end of the original 90 minutes. However, making multiple substitutions each during extra-time was not in contravention of the rules because each still hadn't used up their initially allotted three, before making a fourth.”