The comparison is between the maximum Siberian glaciation and the (implied maximum) Europena glaciation. The Siberian came later than the European. It may be confusing because the higher the BCE number, the earlier in time it was (BCE means "before common era" [the year Zero in the Western European timeline]).
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park sang joonThe maximum extent of western Siberian glaciation was reached approximately 16,000 to 15,000 BCE and thus {the maximum extent of western Siberian glaciation was reached} later than {the maximum extent of glaciation was reached} in Europe (20,000–16,000 BCE).As shown.