It is a lot more than 15% cuts. The latest numbers I saw about grant approvals were something like only half of the number of approved grants compared to the same timeframe last year. On top of that you have the cap of indirect costs at 15%, which is alone more than what you describe. And on top of that are the other ways they are interfering with research, e.g. by the draconic spending limits on credit cards and other arbitrary ways they are blocking money from getting spent.