Hey there. You don't need to worry about anything. 2lakh platelet is normal. The doctors must be taking good care of your husband. As long as there is no bleeding or volume loss, dengue does not cause much problem.
Next Steps
Trust the treating doctors. they will do their best to get every patient the right treatment
Health Tips
I think you should ask these questions to your treating doctors. you have all the right to ask them anything and they are obliged to tell you all the details. live healthy