The division bench also held that the single-judge bench's order directing the state government to frame a policy to regulate parking was not permissible in exercise of powers under Article 226.
Thakor, a prominent OBC leader, was elected from Radhanpur on a Congress ticket in 2017 Assembly polls.
Additional Solicitor General Satya Pal Jain, who appeared for Rajput in his personal capacity as lawyer, grilled Patel for two hours before Justice Bela Trivedi.
Patel will be cross-examined by the lawyers of BJP leader Balvantsinh Rajput, his rival in the election.
The former IPS officer, who has been a vocal critic of Prime Minister Narendra Modi, was alleged to have falsely charge Sumersingh Rajpurohit, a Rajasthan-based lawyer for carrying drugs in 1996.
The Patidar leader was convicted in July last year by the Visnagar sessions court in Mehsana district in a case of rioting connected to the Patidar quota stir that took place in 2015.
The 25-year-old had joined the Congress at a party rally in Gandhinagar on Tuesday and expressed his desire to contest the Lok Sabha polls.
Teesta Setalvad case: How can grant of anticipatory bail and liberty to cops to seek custody co-exist, asks SC
The remarks were made during the hearing of the two separate petitions against a singular judgement of February 8 of the Gujarat high court.
Hardik has been convicted in a case of rioting and was sentenced to two years of imprisonment, which bars him from contesting an election.
It came to light during the cross-examination of BJP's Balvantsinh Rajput, who has filed the election petition, before Justice Bela Trivedi.
The apex court collegium further considered the matter and found the three advocates suitable for appointment as high court judges, it said.
The project was launched by Prime Minister Narendra Modi and his Japanese counterpart Shinzo Abe in September last year.
2002 Naroda Patiya massacre: Gujarat High Court acquits ex-BJP minister Maya Kodnani, upholds Babu Bajrangi's conviction
In 2012, she was sentenced to 28 years in jail in the Naroda Patiya riots case in which 96 people were killed during the riots, while while Bajrangi was given life imprisonment till death.
With today's order, the portal will not be able to publish any article related to the businesses of the petitioner until the hearing concludes in a civil defamatory suit filed by him.
Justice J B Pardiwala deferred the hearing after the petitioner - Viacom 18 Media Private Limited - sought time till Monday to submit additional information before the court.