Yes. In Make an Offer V2, you can turn off decline emails.
Open Settings.
In the Email section, clear Email customers when you decline an offer request.
Save the setting.
This sets the default for manual declines, bulk declines, and automatic declines. The checkbox in an individual decline or bulk decline lets you change the choice for that action.
The setting only controls decline emails. It does not turn off accepted, countered, or new-request emails. Accepted emails still include the checkout link customers need to complete their purchase.
This setting is available from version 2.8.0. It does not apply to the legacy V1 app.