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I guess the problem is that you try to load shop2 using ros-load:load-system. For a first test, remove the link you created before and set up asdf2 to include the location you put shop2. Have a look at the ASDF documentation for setup instructions. Now you should be able to load shop2 in the repl by:

(asdf:operate 'asdf:load-op :shop2)

Now, open your asdf file in lispturtles_pkg and add shop2 to the system's dependencies.

While this solution should work, it's not perfect because it requires the user to manually install shop2 and set up asdf. A better solution would be to create a wrapper package that downloads and extracts shop2 into a ros package. For many examples, have a look at cram_core, subdirectory 3rdparty.