About Encoder/Decoder loss function

[zhaotianzi]

After reading the code carefully, I found that the loss function of the encoder consists of three parts.like this
loss_enc = mse + critic_score_valid_x - critic_score_fake_x
i can understand 'mse',but i can not understand "critic_score_valid_x , critic_score_fake_x".
'critic_score_valid_x' and 'critic_score_fake_x' I think it is not related to the encoder.
Is it replaced with 'critic_score_valid_z' and 'critic_score_fake_z'?