2011 Chevrolet Cruze Dealer concern, hose

Dealer claims radiator hose leak caused timing chain tensions and head gasket to blow.
Last month both timing chain and head gaskets and ALOT more were repaired. Just want to know.
If a radiator hose can cause timing chain tensiin issues
And with what repairs do the radiator hoses need to be replaced so I know of any of the repairs they have done have neglected the change of the radiator hose.