Not at all.. The whole idea of is it lossy or lossless is being put through a washing machine. If you say MQA is lossy compared to a 192/24 stream, then literally everything can be lossy compared to whatever you choose as a reference. 192/24 is lossy compared to DXD for example. The fact that MQA has a non-rectangular capture window doesn't make it lossy in the traditional sense. It just means they've optimised the capture window to what they believe is important to record in the first place. It's the same argument for distributing in 44/16, everything that went in will come out as intended. Now, I don't think anyone has any inside information currently on the fold and unfold transform - this may be done as a data based operation (Like with Dolby technologies) or it may be an audio-space transformation. It's entirely possible the low level high frequency information is a data-difference stream embedded in the 44/16 audio, and the MQA decoder is able to fully restore the original triangular window without doing using a break-point notch. If that is the case, the system is lossless as per it's original intention, and DSP is not involved in the reconstruction. But I digress, it's entirely circumstantial.