It depends on the regulations in force. Usually, depending in the reason for revocation, the pilots can apply for recertification after a set period (usually one year) where they have to go through the whole process again. For example, according to 14 CFR 61.13,
(d) Application during suspension or revocation.
(2) Unless otherwise authorized by the Administrator, a person whose pilot, flight instructor, or ground instructor certificate has been revoked may not apply for any certificate, rating, or authorization for 1 year after the date of revocation.
It appears that these pilots too, can get another certificate after an year. According to Kuwait Civil Aviation Safety Regulations, Part 1,
1.2.11 Surrender, Suspension or Revocation of License, Certificate or
3) Unless the order of revocation provides otherwise, a person whose
License/ authority /certificate is revoked, may not apply for any
License, certificate or authority before the elapse of one year from
the date of revocation.