Yes, that is quite literally the point of compression. To reduce quality and save file size.
Not sure why he doesn't state it in the post but this is in the text document provided with the Compressed version.
Rich (BB code):
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Hi, thanks for reading!
Compression is un-official, it may or may not break your game.
It probably won't but hey, fair warning!
Compression tool used: UAGC:
https://thef95zone.info/threads/ultrafast-adult-games-compressor-v2-5-2.80592/
One last thing, this was compressed for the fine folks of F95zone :)
https://thef95zone.info/
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Image quality = 80%, Audio quality = 40kb/s, Video quality: crf = 39