
Umbranus |

The aldori swordlord's deft strike ability states that it does not work if he is wielding a shield or an off-hand weapon, including armor spikes, unarmed strikes, or natural weapons.
How oes that interact with the magus' spell combat and spellstrike?
Fluff wise spell combat is described as being similar to TWF with the spell being cast as the offhand attack. But spells are not really wielded (there are exceptions but in general).

Stome |

They work together just fine. The fluff of it working like TWF with a spell does not change that a spell is not a weapon. (well unless we are talking weapon like spells but that does not apply here.)
Honestly they need to stop using lazy writing like "functions like X" because it brings forth really stupid problems like the flurry of blows mess.

Grick |

The aldori swordlord's deft strike ability states that it does not work if he is wielding a shield or an off-hand weapon, including armor spikes, unarmed strikes, or natural weapons.
That's poor wording, since off-hand only exists when two-weapon fighting. Anyway, even though Spell Combat functions much like two-weapon fighting, it's not two-weapon fighting, so you should be good.