Doesn't this say the employer is relieved from liability if the following three conditions are met?

(paraphasing)
1.traveling to and from the job
2.after the works done
3.if it's not compensable (billable) work?


(b) Under section 4 of the Portal Act, an employer who fails to pay
an employee minimum wages or overtime compensation for or on account of
activities engaged in by such employee is relieved from liability or
punishment therefor if, and only if, such activities meet the following
three tests:
(1) They constitute ``walking, riding, or traveling'' of the kind
described in the statute, or other activities ``preliminary'' or
``postliminary'' to the ``principal activity or activities'' which the
employee is employed to perform; and
(2) They take place before or after the performance of all the
employee's ``principal activities'' in the workday; and
(3) They are not compensable, during the portion of the day when
they are engaged in, by virtue of any contract, custom, or practice of
the kind described in the statute