I agree that is what they are TRYING to do but they cannot do it.
He has an unequivocal right to a FAPE. If they use the line, "we have no staff that can handle him," then they have to purchase services from someone who can.
They can suspend him up ten cumulative days in one school year. Any more than that constitutes a "change of placement."
Do NOT go alone if you can avoid it. No one should go alone.
Martie