Its perfectly good advice and complete relevant to the topic. For one; a large quantity of water takes more energy to heat up than air, so the water should be below ambient air temp for at least part of the day, providing a de facto cool spot. Second, the snake can also cool off by taking a dip in the bowl and air drying off. The evaporation process will remove some heat from the animal. Third, plenty of snakes enjoy an occasional soak and there is nothing wrong with it as long as it is not done excessively, which can cause health proplems, OR if the snake is soaking often due to other underlying husbandry issues.
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