Malvina Weidlinger (Tepper) - Sources? Források?

Which data do you want confirmed?
A Marriage link confirming the Parents names, a child's DoB and an address appears on their son Vilmos' profile.

Malvina's birth certificate or something that proves the dates, her marriage certificate and if possible her death certificate.

Sorry, the records you are seeking are Slovakian rather than Hungarian, so I cannot help. All I can confirm is Malvina's birth year, because Malvina's age appeared on a registration for a stillborn child she gave birth to in Hungary.
https://www.familysearch.org/ark:/61903/3:1:3QS7-994V-92DP?i=87
Mr Deri provided much of the info on her and her parents so can probably advise you as to the source of his information.

Supplementary
This looks to be her burial as Melinda rather than Malvina.

Weidlinger Edéné Tepper Melinda born 1883, buried 1958.
Kozma utca Jewish cemetery- Budapest plot 27B row 13 grave17

So that gives you a death year and the additional possibility of help from cemetery officialdom.