Here are three wing players with their stats pre- and post-Achilles surgery:

For the record, KD suffered his at age 31 in 2019, Kobe at age 35 in 2013, and Dominique at age 31 (back in 1991). Dominique's is probably the most remarkable because his Achilles injury happened 34 years ago (presumably medical treatment for Achilles tears has improved since then) and he had his highest scoring average the year of his comeback. KD's personal production is virtually unchanged, while Kobe's diminished, but he was 35 years old when he tore his Achilles so he was already losing his explosiveness anyway.
It's never easy to recover from any type of serious injury so it's understandable that Scaryjerry, given he's a pessimist and very bearish on the Cs in general and Tatum in particular, would feel that Tatum has zero chance of being successful from now on and will be a useless waste of space and money. After all DeMarcus Cousins suffered two Achilles injuries and was never the same. But in Tatum's favor are a) he is young, at 27; b) he is in great physical condition; and c) his game relies more on his jumpshot than his driving to the basket (which we all complain about). But, we'll never know how he reacts to surgery and recovery until it actually happens, so debating what he will be like coming back is really a futile (although fun) exercise. But, that's what forums like this are for

* disclaimer being that I don't actually know if Tatum has an Achilles injury