count is kind of misleading, it looks like
ActiveRecord::Calculations.count
https://api.rubyonrails.org/classes/ActiveRecord/Calculations.html#method-i-count
but counts is a hash, so it uses Enumerable#count
https://ruby-doc.org/core-2.7.1/Enumerable.html#method-i-count.

From the Ruby style guide: Don’t use count as a substitute for size.
https://github.com/rubocop-hq/ruby-style-guide#count-vs-size