Not exactly a typo.....but it's not a routine that's 'set in stone' either. At this age A time will be somewhere between 1.5-2h so the sample routine just reflects the variation between LOs or between different A times in the same day.
The key for your LO is to find the right A time that gives a good nap (ideally 1.5-2h) which results in LO being well rested. It's not essential for every A time to be the same, nor is it essential for every feed to be exactly 3.5h apart.
Another example might be:
WU & E 7am
A (1h30)
S 8.30-10
E 10am (so three hours from last E, but that's ok)
A (1h45)
S 11.45-1.45
E 1.45pm (3.75h from last E, also ok)
A (1h45)
S 3.30-5pm
E 5pm (3.15h from last feed)....... Etc etc
Do you see what I mean? EASY isn't about fitting LO to what any book says, or making them fit a rigid pattern. It's about following cues and developing a predictable pattern of EAS to the day so LO and you both know what to expect
Hope that is some help x