It’s frustrating to say the least that we’ve had no response in over three years as to whether this (seemingly simple) feature will be implemented.
It’s a standard interaction that really should be there. The iPad is crying out for a quality design software, but having to deal with a lack of a delete keyboard shortcut is a major distraction to a designer’s workflow.
Vectornator is a free tool, and when you select an object and hit backspace, it deletes it.
Affinity Designer is a great piece of software and one of the few genuinely Pro level apps for iPad. There’s been some great updates, but don’t forget the little details that will make a big difference.