It's true that suicidal crises may occur. That's obvious. However, earlier I cited the example of the patient who was chronically suicidal. His state has improved. He was suicidal for 20 years, but now is not. Suicidality can be acute, but it can also be chronic. There are subtle differences.
That's why we say it's extremely difficult to differentiate a suicidal patient from one who makes a genuine request for medical assistance in dying. We can't do it. There may be the obvious cases, but there are many cases between the two extremes. It's those cases that are becoming extremely difficult.