Actually Intervals.icu does leave the pause out of the TSS calculation, it does that even if you don’t pause otherwise rides with punctures and coffee stops get inflated TSS. TSS of 151 for 4h30 doesn’t seem high.
The time in zones info is incorrect. Intervals.icu uses “moving” to decide what to include there and this ride has no velocity or moving streams. I should be able to fix this because there is no data for that 90 min part.