Nope. Your information is wrong. After Krunal tested positive, 8 of his close contacts were isolated and tested for COVID. And today all of them have returned negative results. But the problem for India is that these individuals need to remain in isolation for at least 3-4 days, until it is confirmed that they are not infected with the virus, and therefore won't be able to take part in the remaining T20I matches.
It is a big mystery how Krunal got infected with the disease. The Indian team was allotted an entire hotel for themselves and even the hotel staff are part of the bubble. No outside contact is allowed. After Krunal returned positive test, all the staff members were tested and none of them returned a positive result. At this point the Sri Lankan management is also clueless on how he got infected.
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Edit
Guess there is some chance of gameplay today
Today they will be playing the second T20 match, the series has not been cancelled but, a last-minute decision can be taken. Krunal is out of the series and 8 players are in isolation as a precaution. Shaw, Surya Kumar, Ishan and Hardik will not be playing today and tomorrows match. Who will be replacing these players I have no idea.