OK, just checked a 2002 Corolla passport. They had a 5K AND a 7.5K interval, you chose which based on your vehicle usage.
So it does seem Toyota abandoned their 7.5K intervals they had at one time for ALL or Many of their cars, not just Hybrids, but abandoned it, probably because they got burned with the sludge problem.
Excerpts from a 2002 Passport:
Determining the Proper Maintenance Interval
Depending on your circumstances, you should obtain maintenance for your
Toyota every 5,000 miles or every 7,500 miles. Follow these guidelines to
determine which interval to use.
5,000-Mile Intervals
Use 5,000-mile intervals if you primarily operate your vehicle under any of
the following conditions:
• Driving on unpaved or dusty roads.
• Towing a trailer or using a car-top carrier.
• Repeated trips of less than five miles in temperatures below freezing.
7,500-Mile Intervals
Use 7,500-mile intervals if you primarily operate your vehicle under conditions
other than those listed above.
Cars and Sienna
If you choose 5,000-mile intervals, follow the instructions below the light blue
bars in the “Cars and Sienna” charts, such as this one:
5,000 Miles or 4 Months
If you choose 7,500-mile intervals, follow the instructions below the dark blue
bars in the “Cars and Sienna” charts, such as this one:
7,500 Miles or 6 Months
At 15,000-mile increments, the 5,000-mile and 7,500-mile intervals coincide.
Therefore, the colored bars appear together, as in this example:
15,000 Miles or 12 Months
15,000 Miles or 12 Months