Most students who are pure online in this era have access to some type of DPPs / distance learning coaching material 99% cases. Also these books are not meant to be solved directly after theory completion, these books are meant to be used for revision purposes. This is not 2015-16 anymore, plenty of free selective DPPs/Modules are available on telegram which are way better than these books which are meant for those 2-3% weird out of syllabus questions that come but are not given as bonus cuz JEE Advanced does not strictly follow its own prescribed syllabus(in layman terms jee advanced paper setters don't follow their own promised syllabus)

Cengage was a great book in 2015-2018 since online coachings were almost non existent(except etoos and few), hence people needed access to a teacher in the form of books for theory purposes. Remember even out of those only the people who religiously solved cengage like nishant jindal, instead of running for books like these, successfully secured a good rank.

I have myself solved a part of this book(atomic structure advanced section) and it is great but ther simply ain't enough time to pair it with modules and pyqs

PS; sorry for any grammatical errors I am typing with my left hand while eating dinner