That page does not come up for me..
But lets also take a moment to remember that Retevis also posted on their website and on Youtube, a video showing/proving that you can add their 25W external linear amplifier to the original RT97 and it will then output 25 watts.. They even showed a power-test on the video to prove it..
..... Until a big GMRS youtuber came along and called them out by pointing out that it would output more power but it will not be able to RECEIVE anything because the amp is placed after the duplexer....and if you placed the amp before the internal duplexer that was rated for 5W, it would destroy it... Then they deleted everything....