It's important to know that Windhorst is either lying, or Klutch antagonistic for no reason. Murray couldn't sign a contract this year.
http://www.cbafaq.com/salarycap.htm#Q51
The bolded parts are the important parts.58. Can existing contracts be extended?
Contracts for fewer than three seasons may not be extended. Longer contracts can be extended under certain cir stances:
Type of contract Can be extended Three and four seasons Second anniversary after contract signed1 Five and six seasons Third anniversary after contract signed1 Extended contracts Second anniversary after extension signed2, if the extension lengthened the contract to three or four seasons (including any remaining seasons on the existing contract). If the extension lengthened the contract to five or six seasons (including any remaining seasons on the existing contract), it can be extended on the third anniversary after extension signed. Renegotiated contracts Third anniversary after renegotiation signed, if a salary was renegotiated upward by more than 10% Rookie scale contracts From the end of the July Moratorium to the day before the start of the regular season preceding the player's last option season3
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Veteran extensions:Note: certain players (called Designated Veterans) can receive longer and more lucrative extensions than described here, if they meet specific service, tenure and performance criteria. Designated Veteran Extensions are covered in question number 24.Extensions to contracts that are not rookie scale contracts (i.e., veteran extensions) may be signed up to June 30, the day before the player would have become a free agent. However, an extension cannot be signed starting on the first day of the regular season and through June 30 if more than one season remains on the contract (in other words if more than one season remains, they have to complete an extension before the season starts, or otherwise wait until the last season of the contract).
Murray's third anniversary from his extension is 10/22/2022. The first day of the season this year is 10/18/2022 (for various reasons, the regular season is expected to begin on that date rather than 10/25, but I actually wasn't able to determine for sure). Because the Spurs waited until the last minute, Murray's window won't open up until after the end of the regular season. I mentioned this a couple of days ago when lamenting the team's inability to renegotiate and extend him. But it's not okay for Klutch to not know an extension wasn't possible in the first place. Maybe they didn't but I think it's something that "seems like it would be true" more than it was actually true. If that did happen, it is a pointless bit of thorniness considering that the extension is most likely impossible.