This is how management should always talk about the squad.
Ralf came and said that "The squad need open heart surgery" and similar quotes that all outright stated that they needed several players in key positions to replace current players in the middle of the season. - It ended with Ralf alienating the squad and any attempt at uniting the player group never even started.
Outwards you only speak positive, be critical of yourself, but praise the team. Only be critical when shock upsets happen, like losing to Yeowil Town or 4-1 to Watford away. Then you can say "The team failed to deliver". Outside of that: Always take the blame. Lead.
The club has already stated that they are buyers this season. Everyone both knows and understands that.
What Ten Hag and Murtough achieves by saying that they believe in the squad is that you create less clickbait drama for media to latch on to, and you avoid criticizing the players in public. Never criticize when you dont have to. Ever.