@Burty117 - in some tests, the 5700 XT does hold against a 1080 Ti:
www.techspot.com
So it's possible he made the purchase based on information such as this.
Edit: if you go through Steve's test data, the overall picture between the RX 5700 XT and GTX 1080 Ti is much clearer:



AMD Radeon RX 5700 XT and RX 5700 Review
AMD's brand new Navi 7nm GPUs are significantly smaller than previous Vega 56 and 64 parts, packing fewer transistors on a much smaller package, so we expect...




So it's possible he made the purchase based on information such as this.
Edit: if you go through Steve's test data, the overall picture between the RX 5700 XT and GTX 1080 Ti is much clearer:


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