Using AWS CDK with Serverless Framework

Link to chapter — https://serverless-stack.com/chapters/using-aws-cdk-with-serverless-framework.html

What’s the reason behind deploying lambda with

$ AWS_PROFILE=production serverless deploy --stage prod --region us-east-1

but

$ AWS_PROFILE=production npx sst deploy --stage prod --region us-east-1

for others?