Your's Fort Victoria Class is 38,000 metric tons fully loaded
Most replenishment ship are between 30,000-55,000 ton. US have 2 different set of replenishment oiler, 1 is a fast combat support ship (Supply class) which is 50,000 tons, another is Henry J Kaiser class replenishment oiler which is somewhere between 40000-42000 tons
It is not at all new for oil replenishment ship to go over 45,000 tons but it have a trend to start scaling back, US just retired the Sacramento Class which goes up to 55,000 tons.
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Fort Victoria
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USNS Supply
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USS Sacramento
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USNS H J Kaiser
My guess is, the Chinese replenishment ship is the same size and tonnage to USNS Supply. Which display 42,000 tons judging from the surface infrastructure