I feel Moshiri has not done anything too off here, with the exception of accepting defeat to the big clubs as being normal.
He's trying to make it clear Koeman will not be going anywhere in the short term - which I think needed some sort of statement after the results we have been getting.
Also, saying he will give Koeman "support" to me means he will give him whatever he needs to get the job done. It doesn't mean he necessarily has faith that he will get us out of this mess, just that he plans on giving Koeman the tools he asks for. If it doesn't work out though - then you would hope he will not hesitate in sacking him.
At least, that's how I like to read it.