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Thanks for bringing this issue up. There is a bug in the temperature estimation.
The total loss for the converter U1 (2.6W) is including the high-side FET, low-side FET and the quiescent current losses. However, when estimating the temperature, only the max loss of these three is considered. In your case, it is the High side FET with about 1.4W loss and a theta-ja of 27.2C/W. With an ambient temperature of 25C, Tj is estimated to be 67C.
However, in reality, you should take in 2.6W into account when calculating the Tj = 25C + 2.7W*27.2C/W ~ 96C instead of today's 67C.
