Freight Tax Deposit Related

If ₹1349 is the total price, then ₹50 freight would include GST too.

Yes you're correct

Here think from different aspects ,like if company selling the goods through online ,& online agency charging freight charges from seller ,then freight Will part of the cost of the product, and automatically will add with taxable value , buyer have to pay tax on such taxable value ( including freight)
in other side seller paid freight charges to online authority, e-commerce,it's input service from seller perspective,so seller can take ITC on freight charges ...