Open the FLAC file in Spek. An authentic 16-bit/44.1k FLAC will show a sharp cut-off at 22.05 kHz (Nyquist frequency). If you see frequencies above that, it is a fake high-res upscale. If you see a blurry cut-off at 16 kHz, it is a lossy MP3 transcode.
The "Maxwell Embrya FLAC Repack" represents a music release strategy that prioritizes audio quality and potentially offers a comprehensive or updated collection of the artist's work. While detailed information on Maxwell Embrya and this specific release is limited, the use of FLAC and the concept of repackaging highlight important aspects of music distribution and consumption in the digital age. For music enthusiasts and audiophiles, such releases offer a way to engage with artists' bodies of work in the highest possible quality.