As of my last knowledge update in September 2021, there is no widely accepted information to suggest that Ringo Starr lost his drumming ability after leaving the Beatles. Ringo Starr is still an active musician and continues to perform and record music. While it is true that his drumming style may have evolved over the years, there is no concrete evidence to support the claim that he lost his drumming ability.
It is important to note that as a musician ages, their playing style and abilities may change due to various factors such as physical health, preferences, and musical influences. Ringo Starr’s drumming has been a defining element of his musical career, and he is generally regarded as a highly skilled and influential drummer in the history of rock music.
If there have been any developments or changes in Ringo Starr’s drumming abilities since 2021, I recommend checking more recent sources for updated information.
He didn’t. But he is one of only two living Beatles, who are still revered as musical gods by many, and he stepped out front because people come to see him. He still plays the drums, but he hired a full time drummer, (Gregg Bissonette), so that he can be out front connecting with his fans. But Ringo can still play.