He was hired in Oct 22 and fired in June 23, which means he had the Jan 23 transfer window. In that window (via lookup in wiki), they purchased:
Badiashile, striker Fofana, Santos, Mudryk, Madueke, Gusto, Enzo Fernandez and Jimmy-Jay Morgan
If I remember right, negotiations for Mudryk and Fernandez were directly managed by his Boehlyness himself. The rest were actually decent buys. Now, how much of this involves Vivel, I'm not sure.
Most of the rumours at the time was that there were just too many people appointed and the powers that be preferred Paul Winstanley and Laurence Stewart's vision, which didn't leave much room for Vivell to really do anything.
I don't recall there being any drama, just too many cooks.