Can the insertion of one part into another part in patent writing be interpreted as the active connection of two parts?

Everything you said is written in the claim, right? So how did your avatar write it? If even the embodiment is written with active connection, then it is difficult for you to convince the examiner with explanation.

Generally speaking, in the way of plug-in, if the plug-in piece and the plug-in hole are round, only rotation can be realized, and no movement in other directions can be made. What's more, the "back-end connection" you wrote is not a common connection method, and the examiner can easily think it is a fixed connection.