en.wikipedia.org/wiki/Sigismund,_Holy_Roman_Emperor

The chronology here is wrong.

The article first discusses Ladislaus's 1403 intervention in Dalmatia, then says he had already sold the Dalmatian cities to Venice before departing. But standard references date that sale to 1409, several years later:

• Reference works on Ladislaus of Naples state that in 1409 he sold his rights to Dalmatia to Venice for 100,000 ducats.
• The official history page of Split-Dalmatia County likewise says Ladislaus was crowned in Zadar in 1403, and then sold Zadar and rights to Dalmatia on 9 July 1409 for 100,000 ducats.

So the article merges Ladislaus's 1403 campaign and his 1409 sale into a single sequence, which is inaccurate.

This overstates Sigismund's place in the dynasty.

He did die without a legitimate son and is often described as the last male of the imperial/senior Luxembourg line. But he was not the last male member of the entire House of Luxembourg.

Evidence:

• Encyclopaedia Britannica's historical entry on the Luxemburg family notes that there was a French branch of the Luxemburg family, descended from Waleran, lord of Ligny and Roussy, a younger son of Count Henry II.
• The Bibliothèque nationale de France authority record shows that Louis de Luxembourg (also listed as Louis de Luxembourg, count of Ligny / Saint-Pol) was born in 1418 and died in 1475. That makes him a male Luxembourg alive during and long after Sigismund's lifetime.

So the unqualified statement that Sigismund was the last male member of the House of Luxembourg is inaccurate; at most, he was the last male of its ruling imperial branch.