That's how I'd read that bit of the tweet. Luckhurst seems to feel that a Blind/Carrick midfield isn't dynamic enough to challenge Arsenal. Not sure that's wrong. Blind did not play well last night, seemed to get lost by the pace of the game, and in the second half just got sucked deeper and deeper.
Still, the first point, that the Herrera substitution was tactical is what stands out.
If the Herrera sub was tactical it was because Van Gaal decided that instead of playing to win, he wanted to ensure we didn't lose. Had Moyes made a similar substitution Old Trafford would have groaned at the sight of it. Van Gaal is using his reputation to ride out ridiculous decisions.
I was no lover of Moyes, everyone knows that, but I know for a fact that if he was doing the kind of stuff Van Gaal has been doing he'd be getting slaughtered. Why is what's good for the goose not good for the gander when it comes to Van Gaal? Sometimes it feels like people were more willing to criticise Fergie for playing Sheasy and Smudge in midfield than to criticise Van Gaal for his bizarre tactical changes.