Agree that UCB is a reach and will be expensive, competitive, and not a “match” for your son. It is a publicly funded university, so the funds come from the State’s taxpayers. As an international student, admission and costs are extremely limiting. Merit aid wouldn’t come anywhere near the costs of attendance.
As for UW, would also be considered a reach since their CS program is impacted. It is also a popular public university, and, as a non-resident international student, it would be extremely competitive. You would be expected to pay full fees of ~$63K.