I cannot reproduce this error using the 1.7.1 binaries with CUDA11.0 as well as CUDA10.2 and this code snippet on an RTX2070:
import torch

print(torch.cuda.get_device_name())
print(torch.__version__)
print(torch.version.cuda)
x = torch.randn(1).cuda()
print(x)

Result:
GeForce RTX 2070
1.7.1
11.0
tensor([1.7284], device='cuda:0')
...
GeForce RTX 2070
1.7.1
10.2
tensor([0.8304], device='cuda:0')

so the binaries should contain the needed architecture code.