That's only for direct admit- which is for like 10% of seats only. Others in IITD have interview- its like 70% GATE score and 30% interview. So, those having very high GATE score are given direct admit provided they have good CGPA- just to avoid interview hassle for them.
If CGPA is 6.5 (60%) and above all M.Tech. opportunities are sure, For direct Ph.D., research admission CGPA might be important as many profs consider it important. But you certainly have no cause for worrying.
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