Hello,

No, it is not mandatory to use xAPI-launch server. Only if you use the adl-xapi-launch server (https://github.com/adlnet/xapi-launch) to launch your content you would need to use "adlxapi" launch method.

In other words, it all depends on how you will launch your content... you just need to tell the Adapt course to use the corresponding launch method. 

You can find more detailed information here: https://github.com/Acutilis/adapt-tkhub-xAPI/wiki/3.-Launch-methods