What are your thoughts on intubation?

When you need a surgical procedure, intubation can be common. I was a respiratory therapist and took care of many who had the tube for a few hours and did fine. I too had a tube for surgery. Many of the meds given have an amnesic effect and even I never felt the tube.
So food is lodged deep in the lungs and need to be vacuumed out, otherwise he could end up with life threatening pneumonia. Even if he had orders for DNI, the benefits of this procedure should be greater. This procedure will be a half hour or less. There may be a small risk of a longer intubation. Why are you not talking to his physicians?

Yes, this is serious as Barb says. Your Dad is now going to need a different diet so this does not continue to happen. His water my need thickening too.

Your fathers problem causes pneumonia which is very serious in the elderly.

Are they saying they need to do a bronchoscopy to remove the food?

Intubation to me means putting in a tube that aids breathing on a long term basis; a bronchoscopy is a short procedure.

The bigger issue is that your dad is aspirating food. He needs a swallow study to figure out if he needs pureed food, thickened drinks and other modifications around eating.

If limits on his eating are going to be difficult for him due to his dementia, you might want to consider having a hospice consult after the bronchoscopy.

Have the docs explain in detail what will happen if you don't proceed because some deaths are harder than others.
Is he not conscious? Because if he is the decision is his.

I don't think he has a choice. You can't leave food lodged in a person's lungs.