What does "落地" in "政策落地" mean? Does it mean the policy is grounded,  getting nowhere, futile or scrapped?

And is it the same as 落地签证?
From this article
国家税务总局近日召开全国视频会议，部署贯彻落实国务院6项减税新政策，要求各级税务机关采取切实有效措施，确保减税政策落地见效。


Policies are decided at the top (by the law makers in the central government).

'落地' means 'to land' or 'to touch down'

'政策落地' means a Central government decided policy is passed down to the ground level (responsible agencies and local governments) for implementation

政策落地见效 means a policy is immediately effective upon implementation



And is it the same as 落地签证?

No, they are not the same
落地签证 means 'visa on arrival '; '落地' means 'arrival' here

落地签证是指申请人不直接从所在国家取得前往其他国家的签证，而是持护照和该国有关机关发给的入境许可证明等抵达该国口岸后，再签发签证，落地签证通常是单边的。