But, as critics have pointed out correctly, the LIGO alert for this event came 40 minutes after NASA’s gamma-ray alert. For this reason, the event cannot be use

But, as critics have pointed out correctly, the LIGO alert for this event came 40 minutes after NASA’s gamma-ray alert. For this reason, the event cannot be used as an independent confirmation of LIGO’s detection capacity. Leaving aside the question of why there was a "delay", this is a fundamentally incoherent and meaningless critique on Hossenfelder's part. (Well, unless you want to take seriously the implication that the LIGO team could have used that 40 minutes to create a fake alert to go with the gamma-ray alert.) As long as we have reason to believe (and we do) that the LIGO data record is valid, then when the alert was issued is irrelevant to whether it is "an independent confirmation of LIGO's detection capacity." (The detection of neutrinos from Supernova 1987A was reported about two weeks after the optical detection of the supernova [optical detection: 24 February 1987; Hirata et al. Kamiokande paper submitted to Physical Review Letters in early March of 1987]. So I guess we should question whether neutrinos from SN 1987A were ever really detected?)