No.
I checked all stories that were published in
Helsingin Sanomat of 29.9.1994 that contained the word 'Estonia' in it.
There is no mention of a 'strong wave' knocking off the bow visor.
There is an article with caption "Vettä pääsi autokannelle todennäköisesti keulasta Tutkijat kahlaavat huhujen ja tiedonsirujen tulvassa" (
https://www.hs.fi/kotimaa/art-2000003370249.html , subscription needed to read it) that speaks about possible causes of the sinking. There are no mentions of waves knocking the bow visor off.
The article says that the probable cause for sinking was that water got in from front. Then it says "On täysi arvoitus, miksi vesi pääsi portin läpi". This translates to: "It is a complete mystery why water got through the gate".
Then it gives two speculations, identifying that they are speculations. One is that water got through poor quality sealing and the other is that a badly-fastened truck got loose and broke through the gate.
It also speculates on whether the visor and the gate were left open but concludes that it would be very unlikely.